Midland Radio SD174 UHF TRANSCEIVER TRANSMITTER PORTION User Manual sd 170 manual

Midland Radio Corporation UHF TRANSCEIVER TRANSMITTER PORTION sd 170 manual

USERS MANUAL

SD-174 Data Radio User Instruction Manual
2 FCC RF Exposure Compliance Requirements The Federal Communications Commission (FCC), with its action in General Docket 93-62, November 7, 1997, has adopted a safety standard for human exposure to Radio Frequency (RF) electromagnetic energy emitted by FCC regulated equipment. Maxon subscribes to the same safety standard for the use of its products. Proper operation of this radio will result in user exposure far below the Occupational Safety and Health Act (OSHA) and Federal Communications Commission limits. Power listed is conducted. This device must not exceed a maximum transmitting duty factor of 50%. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 49cm (19.29 inches) from all persons, must not be co-located or operating in conjunction with any other antenna or transmitter, and must not exceed a gain of 7 dBc. Failure to observe these restrictions will result in exceeding the FCC RF exposure limits. About your SD-170 Series Data Radio The SD-170 Series of RF Link Modules utilize the latest technology in their designs and manufacturing. SD-170 models are Phase Lock Loop Synthesizer (PLL) / microprocessor controlled and offer two (2) watts of power with 16-channel capability. Multiple functions including 1200 to 9600 baud rates, AC and/or DC audio coupling, GMSK, FFSK and FSK modulation are standard in these fully programmable RF Link Module units. Programmable sub-audio squelch system (CTCSS & DCS) and two-tone squelch system are added to the signal level detect squelch system (RSSI). GPS Data handling is provided to interface and control an internal GPS receiver. To assure satisfaction from the radio, we urge you to thoroughly read the operation and function information in this manual before operating your SD-174. Applications of some of the functions described in this manual are determined by the system you use. Your dealer will program your radio so that you have the greatest number of functions possible relative to your needs. Should you have questions regarding the operation of the radio, please consult your Dealer.
3 Specifications GENERAL Equipment Type ……………………………………………………… Data radio Performance Specifications…………………………………………TIA / EIA-603 & AS-4295 Band …………………………………………………………………… UHF Channel Spacings …………………………………………………… 25 kHz, 12.5 kHz programmable RF Output Power …………………………………………………… 5 watt / 1 watt programmable Modulation Type …………………………………………………… F2D, F3E Intermediate Frequency …………………………………………… 45.1 MHz & 455 kHz Number of Channels ………………………………………………… 16 Frequency Source …………………………………………………… Synthesizer Operation Rating …………………………………………………… Intermittent 90 : 5 : 5 (Standby: RX: TX) Power Supply ………………………………………………………… Ext. Power Supply(12 VDC Nominal) 9V - 18.0V DC EXTREME Temperature Range Storage ………………………………………………………………… from - 40°C to + 80°C Operating ……………………………………………………………… from - 30°C to + 60°C Current Consumption Standby (Muted) ……………………………………………………… < 65 mA Transmit 2 Watt RF power ………………………………………… < 1.0 A Frequency Bands: RX TX UHF : U2 450.000 - 490.000 MHz 450.000 - 490.000 MHz Lock Time ……………………………………………………………… < 10 mS TX to RX attack time ………………………………………………… < 20 mS (No Power Saving) RX to TX attack time ………………………………………………… < 20 mS Dimensions…………………………………………………………… (32 mm)H x (58 mm)W x (125 mm)D Weight ………………………………………………………………… 253 grams
4 TRANSMITTER Specification Carrier Power: ………………………………………………………… Nom. Max. Min. High …………………………………………………………5W < 6W > 4.5W Low …………………………………………………………1W < 1.5W > 0.8W Sustained Transmission …………………………………………… Nominal conditions Time : 5 10 30 Sec. Power: >90% >85% >80% Frequency Error ……………………………………………………… ±5.0 ppm Extreme condition for UHF Frequency Deviation: 25 kHz Channel Spacing…………………………………………… Peak ±5.0, Min. ±3.8 12.5 kHz Channel Spacing………………………………………… Peak ±2.5, Min. ±1.9 Audio Frequency Response………………………………………… Within +1/-3dB of 6dB octave @ 300 Hz to 2.55 kHz for 12.5 kHz C.S. @ 300 Hz to 3.0 kHz for 25 kHz C.S. Adjacent Channel Power 25 kHz ………………………………………………………………… < 70 dBc @ Nominal Condition < 65 dBc @ Extreme Condition 12.5 kHz ……………………………………………………………… < 60 dBc @ Nominal Condition < 55 dBc @ Extreme Condition Conducted Spurious Emission …………………………………… < -60 dBc Modulation Sensitivity ……………………………………………… 100mV RMS @ 60 % Peak Dev. Hum & Noise: 25 kHz Channel Spacing …………………………………………… > 40 dB (with no PSOPH) 12.5 kHz Channel Spacing ………………………………………… > 40 dB (with PSOPH) Modulation Symmetry ……………………………………………… < 10 % Peak Dev @ 1 kHz input for nominal dev +20dB Load Stability ………………………………………………………… No osc at ≥ 10:1 VSWR all phase angles and suitable antenna No destroy at ≥ 20:1 all phase angle Peak Deviation Range Adjustment @ 1 kHz, Nom. Dev +20dB: 25 kHz Channel Spacing …………………………………………… Min. 3.5, Max. 6.0 12.5 kHz Channel Spacing ………………………………………… Min. 1.5, Max. 4.0
5 RECEIVER Specification Sensitivity (12dB Sinad) …………………………………………… Standard B.W < -118 dBm, Narrow B.W <-117 dBm @ Nom. Condition Standard B.W < -115 dBm, Narrow B.W <-114 dBm @ Extreme Condition Amplitude Characteristic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < ±3 dB Adjacent Channel Selectivity: 25 kHz Channel Spacing …………………………………………… > 70 dB @ Nom., > 60 dB @ Extreme Condition 12.5 kHz Channel Spacing ………………………………………… > 60 dB @ Nom., > 50 dB @ Extreme Condition Spurious Response Rejection …………………………………… > 70 dB (100 kHz - 4 GHz) Image Response ……………………………………………………… > 70 dB IF Response…………………………………………………………… > 70 dB Others. ………………………………………………………………… > 70 dB Intermodulation Response Rejection: ±25 kHz/ 50 kHz ……………………………………………………… > 70 dB ±50 kHz/ 100 kHz …………………………………………………… > 70 dB Conducted Spurious Emission @ Nominal Conditions: 9 kHz - 1 GHz ………………………………………………………… < -57 dBm 1 GHz - 4 GHz. ………………………………………………………… < -47 dBm RX Spurious Emissions (Radiated) @ Nominal Conditions 9 kHz - 1 GHz ………………………………………………………… < -57 dBm 1 GHz - 12.75 GHz …………………………………………………… < -47 dBm AF Distortion. ………………………………………………………… < 5% @ Nom., < 10 % @ Extreme condition RX Hum & Noise: 25.0 kHz CP …………………………………………………………… < 40 dB No PSOPH 12.5 kHz CP …………………………………………………………… < 40 dB with PSOPH Receiver Response Time …………………………………………… < 16 mS Squelch Opening Range: …………………………………………… RF level for 6 to 14 dB Sinad Squelch Closing Range (Hysteresis): …………………………… 0 - 6 dB Sinad @ Nominal Condition Squelch Attack Time: RF Level at Threshold ……………………………………………… < 40 mS RF Level at Threshold + 20 dB …………………………………… < 30 mS Squelch Decay Time ………………………………………………… 5 mS Min., 20 mS Max. Antenna Socket Input Match ……………………………………… > 10 dB Return Loss L.O. Frequency Temperature Stability …………………………… 1st < 5 ppm, 2nd < 15 ppm from -30° to + 60° C L.O. Frequency Aging Rate ………………………………………… ±2 ppm/ year
6 Unpacking information Remove and carefully inspect the contents of your package(s) for the following items: Radio Fused power cord User manual If any items are missing, please contact the dealer from which you purchased the radios, or contact us at phone number 1-816-241-8500 or Fax. 1-816-241-5713. SD-174 Features • Synthesized Operation with 16 channel capability • 1 / 5 Watt programmable output power • Programmable 12.5 / 25KHz channel spacing • Channel scan • Busy channel lockout • Tx Time-out timer • Power Save • Marked Idle • Tx Delay • Data transmission and reception through GMSK modem • Data transmission and reception through FFSK modem • Support transmission of global position data
7 Description of radio components  Antenna connector  DB-15 connector  Power connector  GPS Antenna connector (option)  LED (Busy / Tx indicator) Exterior View RV402RV401SW401maxonRV403CON4071234576Digital Board Antenna installation Fasten the antenna to the radio by turning the antenna cable clockwise into the receptacle on left of radio when looking at front of radio.
8 Powering the data radio Your data radio accepts many sources of DC power to permit more versatile use. This radio operates from 9V to 18V DC and standard voltage for test is 12V DC. Connecting the data radio to DC power Connect DC power plug of power cable to radio’s DC IN power connector and then fasten power plug to the radio by turning the ring clockwise.
9 SD-170 Series Operation Channel select / SCAN Your radio’s channel can be selected by inner DIP-S/W or serial command inputted from external control system. To change channel by inner DIP-S/W (), you should open the upper cover and then look for the DIP-S/W() on the digital board of the bottom cover. Once located change the DIP-S/W to select wanted channel according to channel dip switch chart. To use a serial command for channel selection, it should be inputted by external equipment or device(ex. Personal computer) through Pin 8 of DB-15 connector. See the message format for serial command for full details. If your radio has been programmed the channel scan, you must enter the scan mode by serial command. Transmit The transmission will be made by various inputs such as PTT signal (Pin 3 of DB-15 connector), TX serial command and Serial data input (Pin 10 of DB-15 connector : This input is only available when a modem option board is installed). TTL level is used as PTT signal and is active low. If you installed an option modem board, you can use RS-232 level as a PTT signal instead of TTL level. To maintain transmission, continuous PTT signal input is required. If you use Tx serial command for transmission, normally, it’s released by Rx serial command. Before the transmission, check the color of the radio’s top-panel LED(). It will glow orange if RF activity is present; it will not be illuminated if the radio indicates a “clear” channel. When the channel is “clear”, input the PTT signal or Tx serial command and transmit data or audio. Remove the PTT signal or input Rx serial command when you have finished transmission. CAUTION : Operation of the transmitter without a proper antenna installed may result in permanent damage to the radio. Receive When you have finished transmission, remove the PTT signal or input Rx serial command. You will receive data from another radio or hear another person talking from the connected external speaker.
10 Scan modes Scanning is a dealer programmable feature that allows you to monitor a number of channels. Your dealer will help you define a scanning mode and your channel “scan list” Channel scan Once the scan list has been established, initiate scan by serial commands. If a conversation is detected on any of the channels in the scan list, the radio will stop on that channel and you will be able to hear the conversation. At that time, busy channel data is sent to external equipment or device through serial command. So, you can identify busy channel data as decoding of received serial command from your radio in the external equipment or device. Normally, if you try to transmit during scanning, the transmission will be made on the channel that the call was received during the programmable scan delay time. (The scan delay time is the amount of time the radio will stay on that channel once activity has ceased. Dealer programming of 4 ~ 7 seconds is typical). The radio will resume scanning once the scan delay time has expired, and will continue to scan until the serial command for scan stop is inputted by external equipment. After the scan resumes, if a transmission is made, the radio will transmit on the selected priority channel. This feature is similar to priority scan TX except for selection of priority channel. You can assign a priority channel by inner dip switch only. Scan channel delete To temporarily delete a channel from the scan list, simply input the serial command for scan deletion to the radio while scanning and stopped on the channel to be deleted. This will temporarily remove that channel from the scan list until the scan is closed or the radio’s power is reset. CTCSS / DCS Scanning To help to block out unwanted calls to your radio, the SD-170 series can be programmed by your dealer to scan for tones.
11 Channel dip switch chart 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 41 2 3 4 1 2 3 4 1 2 3 4 1 2 3 41 2 3 4 1 2 3 4 1 2 3 4 1 2 3 41 2 3 4 1 2 3 4 1 2 3 4 1 2 3 411623456789101112151413SW401CHANNEL SELECT SWITCHCHANNEL NO.SWITCH POSITION Serial command Serial RX/TX Data Format (1) Asynchronous Serial Data Transfer (2) Baud Rate : 4,800 bit/sec (3) Data Bit : 8bit , Non Parity (4) Stop Bit : 1bit (5) MSB first transmission Each serial command is consist of 3 bytes. 1st byte is command and 2nd is data required by command and 3rd is check sum to decide validity of total contents. Byte0 ST 1st Byte (Command) SP Byte1 ST 2nd Byte (Data) SP Byte2 ST 3rd Byte (Check Sum) SP
12 Data Protocol Protocol for input Serial command Protocol of data transmission from external equipment or device (: PC) to radio : Input serial commandReceive responseResponseExternal equipment or device Radio Protocol for output data Protocol of data transmission from radio to external equipment or device (: PC) : Receive DataReceive DataOutput Data(with command)External equipment or device RadioOutput Data(with command) Serial Commands Transmit Command & data Mode Transmit Command (BYTE0) Transmit data( BYTE1 ) Check sum( BYTE2 ) : Transmit Command + data 1. Channel Change 0x64 0x?? :Current channel ( 0x64 + Channel ) 2. RTX Mode Send. 0x61 R(0x72) : Rx mode T(0x74) : TX mode ( 0x61+0x72 ) ( 0x61+ 0x74 ) 3. Scan Mode From PC To Radio 0x62 F(0x46) : Scan Stop S(0x73) : Scan Start O(0x4F) : Scan Delete ( 0x62+ 0x46 ) ( 0x62+ 0x73 ) ( 0x62+ 0x4F )
13 From Radio To Pc 0x66 0x00 : 1 Channel 0x01 : 2 Channel 0x02 : 3 Channel 0x0f : 16 Channel 0x66 + 0x00 0x66 + 0x01 *Only for Unmute Channel, Correct Call Channel Error Message 0x65  It occurs when Scan Delete command comes except for Busy/Correct Call  It occurs when PTT key is pushed except for Busy/Correct Call.  It occurrs when channel change command exists during Scanning. Control of GPS Power 0x6a 0x00 : GPS Power Off 0x01 : GPS Power On ( 0x6a + 0x00 ) ( 0x6a + 0x01 ) 4. GPS mode Control of GPS Data 0x63 0x00 : GPS Data Disable 0x01 : Release GPS Data to DB-15 0x02 : Release GPS Data to Modem ( 0x63 + 0x00 ) ( 0x63 + 0x01 ) ( 0x63 + 0x02 ) 5. Modem test mode 0x75 0x78 : Enable test data 0x79 : Disable test data ( 0x75 + 0x78 ) ( 0x75 + 0x79 ) GMSK 0x7a 0x00 : Disable 0x01 : Enable ( 0x7a + 0x00 ) ( 0x7a + 0x01 ) 0x7c 0x00 : Disable 0x01 : Enable Mark data ( 0x7c + 0x00 ) ( 0x7c + 0x01 ) 6. Modem alignment mode FFSK 0x7e 0x00 : Disable 0x01 : Enable Space data ( 0x7e + 0x00 ) ( 0x7e + 0x01 ) Receive Command & data Mode Transmit Command (BYTE0) Transmit data ( BYTE1 ) Check sum( BYTE2 ) : Transmit Command + data 0xaa ACK 1 Process Complete Commands 0x55 NACK Note) This command is return signal for receiving command. If Byte2 and sum of Byte0 and Byte1 among received data are same, Radio would send ACK data and execute command. If not, Radio sends Nack data. User would go into next step if receives ACK data. If user receives Nack data, user should send command again. example) If user changes from 1st Channel to 2nd Channel, User should send Channel Change Command ( 0x64,0x02 , ( 0x64 + 0x2 ) ) to Radio. If Byte2 and sum of Byte0 and Byte1 among received data are same, Radio sends ACK data to user and changes to 2nd channel. If not, Radio would send Nack data.
14 Status indicators and audible alert tones Your SD-170 series data radio has a sophisticated microprocessor control which provides a range of LED displays. LED displays operation mode, current status of radio, warning, and etc. Moreover, if you connect the Speaker filtered OUT (Pin 9 of DB-15 connector) to an external speaker, you can hear audible tones at the following conditions: • Attempt to transmit on a channel that is already in use when busy channel lockout has been programmed into the radio • Transmission time has exceeded time-out timer programmed length • When the other group or people finished transmission using repeater See the status indicators and audible alert tones chart for full details. STATUS DESCRIPTION LED COLOR AUDIBLE TONE POWER ON Green-Yellow-Red Busy Channel Yellow Correct Call Green Transmit Yellow NORMAL Transmit Not Allowed Normal Scan Mode Green LED Flash Scan Delete One time Red LED SCANNING Scan All Delete Two times Red LED Busy Channel lockout Two times Green LED Single Beep Tone Time out Time One time Green LED Before 5S T-O-T One time Green LED Single Beep Tone EEPROM Error One time Yellow LED Unlock Four times Yellow LED Communication error with Modem MCU Green LED flash Transmit Hang on time - Single Beep Tone WARNING Under channel programmed sub-audio SQ, when transmission is tried by input of FSK or GMSK data. Two times Green LED Read Mode Red LED flash PROGRAM Write Mode Green LED flash AUTO TEST Yellow Open Squelch Mode Three times Green LED Close Squelch Mode Two times Green LED Save Squelch Mode One time Green LED SQUELCH PROGRAM MODE Init Data Load One time Green LED
15 DB 15 PIN descriptions with input/output level D-Type Pin No. Function Description Signal Type Input/ Output 1 Data modulation IN (Tx Mod) Signal is directly injected to MOD through data low pass filter without pre-emphasis. Analog signal 1KHz audio at 60% peak system deviation input level = 100 to 120mVrms I/P 2 Data unfiltered OUT (RX disc) Discriminator audio from the SD-170. This is the unprocessed AF signal prior to tone filtering and de-emphasis. Analog signal 1KHz audio at 60% peak system deviation produces 200 to 300mVrms O/P 3 PTT In (Tx Key) Signal from the ‘external device’ to key the SD-170 transmitter. This line has an internal pull up resistor to +5V. Pulling the line to 0V turns on the transmitter. Note : If you installed option modem board, you can select RS-232 signal level by Jumper (CON407, ) on the digital board. TTL level 0V = Tx o/c = Rx RS-232 level (option) +12V = Tx -12V = Rx I/P 4 Ground Ground connection to chassis of the radio. 0V (Chassis) 5 Serial Data Out (TXD) Serial data output for radio control or program. It uses asynchronous data format. TTL level O/P 6 Busy (CD) Logic level output from SD-170 to indicate whether a carrier is present or not Note : If you installed an option modem board, you can select RS-232 signal level by Jumper (CON407, ) on the digital board. TTL level 0V = carrier 5V = no carrier RS-232 level (option) +12V = carrier -12V = no carrier O/P 7 Microphone filtered audio IN This signal is injected to the MOD at the point through audio-amplification, pre-emphasis and high pass filtering where sub-audio tone is mixed with audio. Audio 1KHz audio at 60% peak system deviation input level = 6 to 8Vrms I/P 8 Serial data IN (RXD) Serial command or data input for radio control or program. It uses asynchronous data format. TTL level I/P 9 Speaker filtered OUT Audio output from the audio amplifier. It’s filtered by tone-filter, de-emphasis circuit. Audio 1KHz audio at 60% peak system deviation produces Nominal 1Vrms @ 8Ω O/P 10 Serial data IN for option modem The Serial data to be transmitted is input to this pin. It’s only available when option modem board is installed. Inputted data are modulated by modem IC and then injected to MOD. It uses asynchronous data format. RS-232 level I/P 11 Serial data Out for option modem The recovered asynchronous serial data output from the receiver. It’s only available when option modem board is installed. It uses asynchronous data format. RS-232 level O/P 12 Serial data busy for option modem (reserved) To eliminate data loss according to buffer overrun of slave MCU’s memory, it indicates buffer status. RS-232 level O/P
16 13 GPS data input Data input for initial setting of GPS module. It follows NMEA 0183 format and uses asynchronous data format. TTL level I/P 14 DGPS data input Data input for DGPS Correction of GPS module. It follows NMEA 0183 format and uses asynchronous data format. TTL level I/P 15 GPS data output Position data output from the GPS module. It follows NMEA 0183 format and uses asynchronous data format. TTL level O/P
17 Modem option for data communication DESCRIPTION The ACC-513 and ACC-514 are internal option-modems, which are applied to the SD-170 series to increase capability for data applications. The goal of an internal modem is to improve the efficiency for data transmission and provide maximum flexibility for user applications. The most obvious method of increasing the data efficiency is to maximize the data signaling speed in the limited channel bandwidth. But, FSK, called direct FM modulation, has a very wide transmission bandwidth requirement. To solve this problem a GMSK(Gaussian Filtered Minimum Shift Keying) internal option-board can be used. Generally data has a wider bandwidth than audio. So, direct application of data is not matched with an audio system and its application. For instance, if sub-audio (Tone) SQ system applied to a data application, its frequency conflicts with that of sub-audio. Moreover, the inputted data is filtered by the audio filter circuit resulting in broken data transmission. To overcome these problems and provide maximum flexibility, an FFSK(Fast Frequency Shift Keying) internal option-board can be used. COMMUNICATION BETWEEN DTE AND OPTION-BOARD Our internal modem options consist of Slave MCU, Modem IC, and extra circuitry. These option-boards directly communicate with DTE (Data Terminal Equipment) to send and receive meaningful data through the DB-15 connector on the digital board of the SD-170. These modems are designed to accept RS232 serial data format and are also capable of high speed wireless data-transmission between two or more devices. More detailed information for the modem option boards is given in the technical manual for the ACC-513/514. Your dealer will help you define a TX On/Off delay time, RX On delay time, Baud Rate, Modem Enabled, Modem Baud Rate, Data flow control, and Test Mode. Table for modem speed Channel Space DTE Baud Rate Modem Baud Rate 1200 1200 Narrow (12.5KHz) 2400 2400 1200 1200 2400 2400 Standard (25KHz) 4800 4800 Table 1. Available Baud rate for FFSK modem
18 Channel Space DTE Baud Rate Modem Baud Rate Narrow (12.5KHz) 4800 4800 4800 4800 Standard (25KHz) 9600 9600 Table 2. Available Baud rate for GMSK modem Transmission GPS Data through Modem The SD-170 supports GPS data handling. That may help your implementation for a system related to GPS. If it is not enough for your application, received position data from the GPS module placed in an SD-170 can be reprocessed by your own application. The ACC-515 is a GPS module for the SD-170, which releases 11 different output data according to the NMEA-0183 format, which can be selected by you, the available data should be processed by your application. Received data from the ACC-515 will be released via the DB-15 connector of the SD-170 and/or transmitted to another system through an installed modem. More detailed information for the GPS option board is given in the technical manual for the ACC-515.
19 Option board pin-out chart FFSK Modem Option board Connector No. Pin No. Function Description Input/ Output 1 VCC 6V to 12V Power Input I/P 2 GND Ground 3 PTT Signal from the digital board to transmit data key the SD-170 transmitter I/P 4 TXD_EN It ensures that the radio has stabilized in transmission before the data is processed for modulation. I/P 5 TX_END To finish transmission, it indicates memory buffer of Master MCU of digital board is empty. O/P 6 MUTE (Busy) Logic level input from digital board to indicate whether a carrier is present or not I/P 7 MODEM_EN Modem Enable input I/P 8 POWER_SAVE Power save input for modem board. I/P 9 CMD_EN It indicates that command for Modem programming is effective. I/P 10 CMD_IN/OUT Data Input and Output for Modem programming. I/P, O/P 11 CMD_CLK Clock Input for Modem programming. I/P 12 MODEM_SEL It Indicates modem type to Master MCU for programming. O/P 13 RX_IN The FFSK/MSK signal input for the receiver of modem IC. I/P Connector 1 14 TX_OUT The FFSK/MSK signal output when the transmitter is enabled. O/P 1 Serial_IN The Serial data to be transmitted is input to this pin. I/P 2 Serial_OUT The recovered asynchronous serial data output from the receiver. O/P 3 Busy To eliminate data loss according to buffer overrun of slave MCU’s memory, it indicates buffer status. O/P 4 Carrier_Detect Handshake signal for RTS control mode. It indicates whether Slave MCU of modem has decoded data or not. O/P 5 PTT_IN Handshake signal for RTS control mode. It requests data transmission to Slave MCU of modem. I/P Connector 2 6 PROGRAM It’s reserved input for firmware upgrade. I/P
20 GMSK Modem Option board Connector No. Pin No. Function Description Input/ Output 1 VCC 6V to 12V Power Input I/P 2 GND Ground 3 PTT Signal from the digital board to enable transmitter circuit of modem board. I/P 4 TXD_EN It ensures that the radio has stabilized in transmission before the data is processed for modulation. I/P 5 TX_END To finish transmission, it indicates memory buffer of Master MCU of digital board is empty. O/P 6 MUTE (Busy) Logic level input from digital board to indicate whether a carrier is present or not I/P 7 MODEM_EN Modem Enable input I/P 8 POWER_SAVE Power save input for modem board. I/P 9 CMD_EN It indicates that command for Modem programming is effective. I/P 10 CMD_IN/OUT Data Input and Output for Modem programming. I/P, O/P 11 CMD_CLK Clock Input for Modem programming. I/P 12 MODEM_SEL It Indicates modem type to Master MCU for programming. O/P 13 RX_IN The GMSK signal input for the receiver of modem IC. I/P Connector 1 14 TX_OUT The GMSK filtered Tx output signal. O/P 1 Serial_IN The Serial data to be transmitted is input to this pin. I/P 2 Serial_OUT The recovered asynchronous serial data output from the receiver. O/P 3 Busy To eliminate data loss according to buffer overrun of slave MCU’s memory, it indicates buffer status. O/P 4 Carrier_Detect Handshake signal for RTS control mode. It indicates whether Slave MCU of modem has decoded data or not. O/P 5 PTT_IN Handshake signal for RTS control mode. It requests data transmission to Slave MCU of modem. I/P Connector 2 6 PROGRAM It’s reserved input for firmware upgrade. I/P
21 GPS Option board Pin No. Function Description Input/ Output 1 VCC 6V to 12V Power Input I/P 2 VBAT Backup Power Input (3.3V) I/P 3 ENABLE GPS Data Out Enable I/P 4 PSAVE GPS Power Enable (& Power save input for GPS) I/P 5 GND Ground 6 GPS_OUT Position Data Output O/P 7 DGPS_IN DGPS Correction Data Input I/P 8 GPS_IN Initial Setting Data Input I/P 9 +5V 5V Power Input I/P Compatible accessory list ACC-513 9600 baud GMSK modem ACC-514 4800 baud FFSK modem ACC-515 GPS receiver ACC-160 GPS antenna ACC-516 PCB Interface - used to separate digital and RF board for alignment ACC-916 Personality programming software ACC-2016 Individual programming cable

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