Philips Medical Systems North America MDL4851 2.4 GHz RADIO MODULE User Manual USERS MANUAL

Philips Medical Systems North America Co. 2.4 GHz RADIO MODULE USERS MANUAL

Contents

USERS MANUAL

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Patient Monitoring
Quality & Regulatory Group
3000 Minuteman Road
Mailstop 0490
Andover, MA 01810
Tel: (978) 659-7383
Fax: (978) 685-5624
Application Note: MDL4851 Instrument Telemetry Module
Prepared by: Delroy Smith
Last revised: 29-Nov-06
The following information is intended for Philips internal use only. It is a guide for the incorporation of the MDL4851
module into Philips patient monitoring medical devices. Interested Philips engineers should contact the Wireless ER
Manager for additional information and referral to specific design specialists.
This document is an internally controlled document under the Philips Quality System.
Philips Medical Systems
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1 Table of Contents
1 Table of Contents 2
2 Introduction 2
3 Host Interface 3
4 Serial Connection 4
4.1 Serial Specification: 4
4.2 Maximum User Data Rate: 4
5 MDL4851-MODULE RF Shielding. 4
6 MDL4851-MODULE Mounting Considerations. 5
7 RF Input/Output, Antenna 5
7.1 RF Transmitter Specifications 5
8 Fault Conditions 6
8.1 Over/ Under Voltage 6
8.2 Excessive Signal Level on Serial Input 7
8.3 Excessive Data Rate on Serial Input 7
9 Accompanying Documentation for products incorporating the MDL4851-MODULE
7
2 Introduction
The MDL4851-MODULE is a serial network adapter designed to be used with specialized medical
devices manufactured by Philips Medical Systems (Figure 1). It enables the host medical device
to wirelessly establish bi directional communication with other remote devices using the Philips’
2.4GHz ROW infrastructure.
Figure 1: MDL4851-MODULE Block Diagram
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3 Host Interface
The MDL4851 radio module interfaces to the host though a single I/O connector (Figure 2). Via
this connector the host must supply DC power, signal ground and modulating data to the radio
module. The communication between the host device and the radio module is a two wire
asynchronous serial interface (Table 1).
Figure 2: MDL4851-MODULE Interface Host Connector
Pin Name I/O Function
1 Ground First of two ground connections for the module.
2 ITS_Tx OUT Serial data to host.
3 ITS_Rx IN Serial data from host.
4 Ground Second of two ground connections for the module.
5 +5 vdc + 5 vdc +/- 5%,
Sinks 38 mA average, 320 mA Peak during radio Tx/Rx
6 Not
Connected
Table 1: Host Connector pin assignment
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4 Serial Connection
4.1 Serial Specification:
The interface to the Host is a serial communication link (Table 2):
Æ Flow Control: Tx, Rx; no hardware flow control
Æ Baud Rate: 115.2 kbaud;
Æ Parity: No parity bit
Æ Bits: 8 bits of data, plus 1 Start/Stop bits
Æ Logic Levels: TTL levels, 5 volt tolerant.
Logical Zero Logical One Conditions
LOW HIGH
0.1 V max 100uA sink
0.55V max 24mA sink
2.9V min 100uA load
ITS_Tx
2.3V min 24mA load
ITS_Rx 0.6V max 2.2V min -
Table 2: Serial Lines, Electrical DC Characteristics
4.2 Maximum User Data Rate:
The maximum user data rate that the radio supports is 12 kbits/second in each direction. This
maximum over the air data rate is fixed by design and cannot be modified by the user.
5 MDL4851-MODULE RF Shielding.
The module contains all necessary RF shielding. The host device does not need to provide
additional shielding. The available module metal enclosure is optional, it is not needed to achieve
EMC compliance.
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6 MDL4851-MODULE Mounting Considerations.
The module is self-contained and can be mounted anywhere using the supplied threaded pem
nuts. No special heat sinking considerations are required. There are no orientation constraints.
7 RF Input/Output, Antenna
This MDL4851 Radio Module has been designed to operate with the antennas listed below, and
having a maximum gain of 2.0 dBi.
Philips M4842-61400
Philips M8100-66490
These antennas cannot be replaced with an antenna of a different type. However, antennas of
equivalent type and equal or lower gain to the listed antennas can be used. Antennas having a
gain greater than 2.0 dBi are strictly prohibited for use with this device. The required antenna
impedance is 50 ohms.
The RF input and output of the MDL4851-MODULE is matched to 50 ohms. A coaxial cable
brings the RF outside the metal enclosure. This cable uses a unique non-standard connector
manufactured by JST (JST part number AYUI-1S-12676-221). The coaxial cable connects to a
JST to reversed TNC adapter made by Amphenol (Amphenol part number 031-6101) where the
antenna plugs in. The antenna is made by Radial to Philips’ specifications (Philips specifications
number A-M4842-61400-1, rev A).
7.1 RF Transmitter Specifications
The following table summarizes general transmitter specifications (Table 3). For complete details
(including details on the receiver section) refer to ES-M4840-90145:
Parameter Specification
Frequency range ISM Band: 2400-2483.5MHz
Radio Channel assignment 48 Radio Channel assigned from 2401.056 MHz to 2482.272 MHz,
with Channels Spacing: 1.728 MHz
Frequency Control Frequency Control to select smart hopper operating frequencies,
only 3 frequencies needed to achieve performance.
A maximum of 6 channels can be selected from the list of 48
channels.
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RF Output Power
FCC: 17 dBm +/-1dB (40 mW to 63 mW, nominal 50mW), into
antenna load
ETSI: 7.0 dBm +/-1dB (4 mW to 6.3 mW, nominal 5.0mW), into
antenna load.
Japan: 8.5 dBm +/-1dB (5.6 mW to 8.9 mW, nominal 7.1mW),
into antenna load.
Note: a) Antenna gain is 2.0dBi max
Transceiver frequency accuracy
during normal operation
<+60/-100KHz relative to channel frequency, includes temperature
compensation & aging effects.
Modulation type GFSK, Gaussian Frequency Shift keying (1M40Q7D)
Modulation Bandwidth Typically 1.4MHz (20dB Bandwidth)
Out of band spurious emission
Levels
< -41dBm in 1MHz bandwidth for FCC limit
Meets ETSI, RS210, FCC, ARIB standards
Table 3: MDL4851 Radio Module, Transmitter Specifications
Applicable
Regulatory
Rule
Allowed
channels
Operating Frequency
Range
Max Power from
Antenna (EIRP)
ETSI 1-46
2402.784 - 2480.544 MHz 10 dBm
FCC, RSS-210 0-47
2401.056 - 2482.272 MHz 20 dBm
JAPAN, ARIB 0-47 2401.056 - 2482.272 MHz 12.1dBm
AUS/NZ 1-46 2402.784 - 2480.544 MHz 10 dBm
Table 4 Radio Specification, MDL4851 Channel Frequency Rules
8 Fault Conditions
8.1 Over/ Under Voltage
The input voltage from the DC power source to the module must remain between the values
specified in Table 1. Operating the radio module from a voltage lower source lower than 4.75VDc
or higher that 5.25 vdc can cause the regulator section to shut down ceasing operation of the
radio module.
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8.2 Excessive Signal Level on Serial Input
The data input signal levels must be observed as specified in Table 2. Driving the input data line
over 5 vdc can cause damage to the radio module input buffers, causing interruption of data
transfer.
8.3 Excessive Data Rate on Serial Input
The host serial communication data rate is fixed at 115.2 kbaud. Clocking data at different baud
rates will result in incorrect data transfer. The maximum host/user over the RF link data rate is 12
kbps. Attempting to send data at a faster rate will result in data buffer overrun and data loss.
9 Accompanying Documentation for products incorporating the
MDL4851-MODULE
Products which incorporate this device shall be labeled as follows:
Contains:
FCC ID: PQC-MDL4851
IC: 3549B-MDL4851
and their accompanying documentation shall include the following:
FCC
Compliance
(USA):
This device complies with part 15 of the FCC Rules.
Operation is subject to the condition that this device does
not cause harmful interference.
Industrie Canada
Compliance
(Canada):
This Class A digital apparatus complies with Canadian ICES-003. Cet
appareil numérique de la classe A est conforme à la norme NMB-003 du
Canada.

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