Mesa Laboratories EPX1 Engine Parameter Transmitter User Manual 01dBi019 User s Man
Point Six Inc Engine Parameter Transmitter 01dBi019 User s Man
users manual
FCC ID: M5ZEPX1
Installation and Operation Instructions for the Engine Parameter Transmitter Model EPX-1.
Point Six, Inc.
Wireless Engine Parameter Transmitter
Model WOW-EPX1
Installation and Operation Instructions
The WOW-EPX1 wireless engine parameter transmitter transmits engine temperature, air
pressure, oil pressure, RPM, Runtime in hours and a unique serial number to a 418 MHz
receiver. The EPX1 is enclosed in a 4X4X2 PVC enclosure for direct attachment to the
firewall of the engine compartment. A 12-pin screw connector provides connection to
12V dc power, air and oil pressure sensors, engine temperature sensor and RPM sensor.
A backup battery provides means to transmit status when primary power is lost.
Application: Attach the PVC enclosure to the engine compartment firewall with bolts
placed through the four-flange holes on the sides of the PVC junction box. Attach the
engine sensors as is indicated on the enclosure lid drawing. The EPX-1 operates on 12
Volts DC . All sensors are provided power on the 12-pin quick disconnect screw
connector on the bottom face of the PVC enclosure.
.
Battery: A 3.0-3.6 Volt lithium battery powers the WOWEPX1 wireless engine
parameter transmitter whenever primary power is lost. The battery will last for more than
10 years in the idle state (primary power applied). The WOWEXP1 will provide backup
function for as long as 2 years at a rate of once each minute once placed in backup
transmission mode. The user cannot replace the battery. The EPX-1 may be placed in a
quiescent state (battery life greater than 10 years and no transmissions) by removing the
runtime backup iButton from the socket on the top surface of the PCB electronics.
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES, OPERATION IS
SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY
NOT CAUSE HARMFUL INTERFERENCE AND (2) THIS DEVICE MUST ACCEPT
ANY INTERFERENCE RECEIVED, INCLUDING INTERF
ERENCE THAT MAY
CAUSE UNDESERED OPERATION
FCC ID: M5ZEPX1
MADE IN USA
Wireless Temperature Sensor Data Format
The Point Six, Inc. 418 MHz wireless transmitters require a compatible receiver with the
ability to receive, error check and provide RS232 and RS422/485 interface. This
document describes the data format provided by the HA8-WOW, HA9-WOW or HA10-
WOW 418 MHz. Receivers.
The transmit packet from a receiver is approximately 15 milliseconds in duration and
consists of 13 bytes of data:
1-byte ID/Mode field
8-byte serial number
2-byte temperature data
2-byte CRC-16 error check
The WOW receivers process this packet. The receivers perform a CRC-16 error check
on the packet. If the data is not accurate it is discarded. When a packet is received that is
error free it is converted to a 29-character packet and transmitted out the serial port at
19,200 Baud. The data is transmitted serially in ASCII Hex format and terminated with a
CR character. This format requires two bytes for each byte of data; 14 data bytes x 2=28
plus the CR is 29 characters
The resulting binary data format of the packet is:
1-byte ID field this field will contain a byte whose LSBit indicates the service
state of the transmitter, 0=normal, 1=service mode.
8-byte serial# this field contains the serial number of the 1-Wire sensor.
2-byte temperature this field contains the temperature data stored MSB first in two's
compliment 16-bit form of 1/16 deg. C units.
2-byte CRC-16 this is the originally received data packet CRC as described above.
1-byte checksum the checksum is a mod 256 sum of all the ASCII character values
in the response but does not include the CR
Example: “EPX” Engine Parameter Transmitter
C5F1D61300050000070000BD2DE1<CR> string from an HA8
45F1D61300050000070000BD2DE1<CR> string from an HA9
The device type field: LSX has device type C5/45 hex. A C4/44 hex when in service
mode.
C5F1D61300050000070000BD2DE1<CR> string from an HA8
45F1D61300050000070000BD2DE1<CR> string from an HA9
The MS-30 bits of these 4-bytes are the Serial number of the EPX. The LS-2 bits are the
status flags for the dc POWERSUPPLY. The LS bit (bit-0) is the is set to 1 when the 12
Volt DC power supply is present and 0 when it is not present.
C1F1D61300050000070000BD2DE1<CR> string from an HA8
41F1D61300050000070000BD2DE1<CR> string from an HA9
This 16-bit field stored LCByte first is the Runtime in hours (0-65535), this value
accumulates based on engine RPM activity. The display value indicates 5 hours.
C1F1D61300050010070000BD2DE1<CR> string from an HA8
41F1D61300050010070000BD2DE1<CR> string from an HA9
THIS 8-BIT FIELD IS THE ENGINE RPM DIVIDED BY 60, THE DISPLAYED
VALUE INDICATES AN RPM OF 960-1020 RPM, (60*16-60*17)
C1F1D61300050010560000BD2DE1<CR> string from an HA8
41F1D61300050010560000BD2DE1<CR> string from an HA9
This 8-bit field indicates Air Pressure in the compressed air system. The reading is in
PSIG units; the displayed value is 88 PSIG.
C1F1D61300050010568400BD2DE1<CR> string from an HA8
41F1D61300050010568400BD2DE1<CR> string from an HA9
this 8-bit field is the Engine Temperature in degrees C. The displayed value is 84
degrees C.
C1F1D6130005001056843CBD2DE1<CR> string from an HA8
41F1D6130005001056843CBD2DE1<CR> string from an HA9
this 8-bit field is the engine Oil Pressure in PSIG, the indicated value is 60 PSIG.
C1F1D6130005001056843CBD2DE1<CR> string from an HA8
This field is the CRC-16 error check as was originally received and checked. This CRC
is over the first 11 bytes of the packet starting with the device type and ending with
inclusion of the temperature data.
C1F1D61300050010560000BD2DE1<CR> string from an HA8
This field is the mod 256 sum of all the ASCII character values in the response but does
not include the <CR>.
91F1D61300050000070000BD2DE1<CR> string from an HA8
This is the CR terminator, 0Dhex.
FCC Radio Frequency Interference Statement
Wireless Engine Parameter Transmitter FCC ID: M5ZEPX1
NOTE: This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to Part 15, Subpart B, of the FCC Rules. This
equipment generates, uses, and can radiate radio frequency energy. If not
installed and used in accordance with the instructions, it may cause interference
to radio communications.
The limits are designed to provide reasonable protection against such
interference in a residential situation. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does
cause interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try and correct the
interference by one or more of the following measures:
§ Reorient or relocate the receiving antenna of the affected radio or television
§ Increase the separation between the equipment and the affected receiver.
§ Connect the equipment and the affected receiver to power outlets on separate
circuits.
§ Consult the dealer or an experienced radio/TV technician for help.
MODIFICATIONS
Changes or modifications not expressly approved by Point Six Inc. could void
the user's authority to operate the equipment.