HARRIS TR-420-A2 User Manual
DM-15
OEM Interface Manual
1 Overview ................................................................................................................................................2
1.1 General ...........................................................................................................................................2
1.2 Operating Modes.............................................................................................................................3
1.3 Software..........................................................................................................................................3
1.4 Hardware ........................................................................................................................................3
1.4.1 Mechanical..................................................................................................................................4
1.4.2 Electrical.....................................................................................................................................5
1.5 References.......................................................................................................................................6
1.5.1 External Document Index.............................................................................................................6
1.6 Test/Certification Requirements.......................................................................................................6
2 Hardware Requirements..........................................................................................................................6
2.1 Module Dimensions.........................................................................................................................6
2.2 External Interfaces...........................................................................................................................8
2.2.1 System Connector.......................................................................................................................8
2.2.2 Accessory Connector.................................................................................................................12
2.2.3 Antenna Connector....................................................................................................................13
2.3 Electrical Performance...................................................................................................................13
2.4 Mobile Station Power Class...........................................................................................................14
2.5 Power Consumption ......................................................................................................................14
2.5.1 Transmit/Talk Mode ..................................................................................................................14
2.5.2 Standby Mode............................................................................................................................14
2.5.3 Sleep Mode (Minimum DC Power consumption) .......................................................................14
2.6 Reliability......................................................................................................................................14
2.7 Environmental Requirements.........................................................................................................15
3 External Control/Interface .....................................................................................................................16
3.1 Introduction...................................................................................................................................16
3.1.1 Common AT Command Ensembles............................................................................................16
3.1.2 IS-136 AMPS/DAMPS Ensembles.............................................................................................21
3.1.3 CDPD Ensembles ......................................................................................................................27
3.1.4 OEM Module Ensemble.............................................................................................................29
4 Safety....................................................................................................................................................31
4.1 Exposure to Radio Frequency Signals............................................................................................31
4.2 Module Operation .........................................................................................................................31
4.3 Posted Facilities ............................................................................................................................31
4.4 Electronic Devices.........................................................................................................................31
4.5 Blasting Areas...............................................................................................................................32
4.6 Potentially Explosive Atmospheres................................................................................................32
4.7 Vehicles........................................................................................................................................32
4.8 For Vehicles Equipped with an Airbag...........................................................................................32
4.9 Responsible Use............................................................................................................................32
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1 Overview
The DM-15 module is intended for mounting into an application developer’s chassis to provide wireless
communication capability for the product. The target chassis could be in a wide variety of forms such as a
residential electric meter, a point of sale terminal, an alarm panel, or an automobile console. All initial
configuration, mode control, and operational commands are issued to the module over an RS-232 serial port
using a flexible AT command format. The module circuitry has been designed to meet the environmental
requirements of a large range of commercial and industrial users.
1.1 General
DM-15 is a fully RF shielded PCB assembly with dimensions of approximately 4 x 2 x .7 inches. It has three
external interfaces: a 30-pin system connector, a 16-pin accessory connector and a miniature coaxial RF
antenna connector.
Figure 1.1 -1: DM-15 Module
2
1.2 Operating Modes
The word “mode”, when applied to DM-15 can refer to either software modes or hardware modes. Desired
usage can be determined from the context. Software modes are the various ways in which DM-15 can be made
to send and receive wireless data. They are described briefly in Section 1.3 below. Hardware modes are the
various ways in which the functions of the 30-pin connector can be changed as needed for testing or to
configure DM-15 for different applications. Hardware modes are described in more detail in Section 2.
1.3 Software
DM-15 software options can be used to configure the module hardware to operate in a wide variety of cellular
voice and data communication modes. The first three software option packages to be delivered for the module
are described below.
1. IS-136 rev. B with IS-130/IS-135 asynchronous data and group 3 fax capability - This software provides
dual mode AMPS/ TDMA cellular communications over the 800 MHz cellular frequency band. The
module automatically switches between the legacy AMPS system and the newer digital IS-136 cellular
system based on system availability and/or manual selection by the host application.
2. CDPD release 1.1 capability - The Cellular Digital Packet Data (CDPD) system provides wireless data
communication at 19,200 bps using standard TCP/IP communication protocol. As such, it can extend full
Internet access to a user’s remote mobile platform. The CDPD system operates in the 800 MHz band
either sharing a traffic channel with the 800 MHz cellular voice system, or more commonly, being
permanently allocated a specific channel for packet data communications. A user is charged for the
number of kilobytes transferred rather than for the minutes of connect time as is normally the case for
cellular voice and data communications. This allows the user to remain continuously connected to the
CDPD network and experience minimal access delay to receive or transmit data.
3. AMPS 553 analog voice with burst data capability – This software option is being offered in response to a
need for a voice/data communications capability with high percentage geographical coverage over most of
the United States and Canada. The AMPS cellular system using circuit switched data is the only viable
option at this time. Although digital cellular systems with data capability are being deployed in several
locations around the county, it will be many years if ever before they have the coverage footprint of the
existing AMPS system. In addition to providing voice communication services, this software option
provides a built-in circuit switched burst data modem over the analog circuit switched cellular network.
V.27ter is used to transmit the data, which is heavily encoded to combat the fading in the mobile
environment. The burst data is operated in a half duplex mode. The module is capable of transmitting or
receiving 250 bytes of data over the analog circuit switched cellular network in less than 5 seconds. The
DTMF tones are used to switch between voice and data modes either locally, or by a remote
communication center.
All of the software platforms listed above include a serial bus multiplexing protocol capability that can be used
by the application developer to create multiple virtual communication channels with the DM-15 module over
the single serial port. A common example of the virtual channel application is providing simultaneous transport
of mode commands, data traffic, and status messages between the module and the main application control
microprocessor.
1.4 Hardware
The next two sections give a top-level overview of DM-15 as seen from the application developer’s
perspective. Hardware design details inside the DM-15 module are described in the “DM-15 Operational
Description”.
3
1.4.1 Mechanical
The DM-15 module has no mechanical elements other that the main PCB assembly. All critical electronic
components are shielded using sheet metal cans to prevent internal/external electromagnetic interference from
degrading the module’s performance and to prevent the module from interfering with other nearby devices.
Figure 1.4-1 shows a typical mounting configuration of the module with the main motherboard assembly. The
module is plugged into the fixed mating connector and secured with four screws to the standoff components.
Figure 1.4-1 Module Mounting Configuration
4
1.4.2 Electrical
Figure 1.4-2 shows an overview of the electrical interface between the DM-15 module and a typical
application.
DM-15 Electrical Interface
Power
User Interface
DTE
External Audio
Interface
Customer Application
HW
Voltage Regulator
Control Processor
Voice & Data Processing
Ÿ
Echo Cancelling
Ÿ
Noise Cancelling
Ÿ
Audio Power AMP
Ÿ
Data Conversion
Power & GND
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Serial Interface
6
1
1
Analog Audio Interface
3
SIM Device
4
Clock REF
Wake
Option
PCM Audio Interface
Antenna
DM-15
Module
5
Figure 1.4-2 DM-15 Electrical Interface
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1.5 References
1.5.1 External Document Index
• Cellular Digital Packet Data (CDPD) System Specification, Release 1.1, 19 January
1995, CDPD Forum
• IS-130, 800 MHz Cellular Systems TDMA Radio Interface Radio Link Protocol 1,
01 March 1995, EIA/TIA
• IS-135, 800 MHz Cellular Systems TDMA Services Async Data and Fax, April
1995, EIA/TIA
• IS-136.1, Revision A, TDMA Cellular/PCS Radio Interface Mobile Station - Base
Station Compatibility Digital Control Channel, October 1996, EIA/TIA
• IS-136.2, Revision A, TDMA Cellular/PCS Radio Interface Mobile Station - Base
Station Compatibility Traffic Channels and FSK Control Channel, October 1996,
EIA/TIA. Referred to here as ‘IS-136’.
• IS-137, Revision A, TDMA Cellular/PCS Radio Interface Minimum Performance
Standard for Mobile Stations, July 1996, EIA/TIA. Referred to here as ‘IS-137’.
1.6 Test/Certification Requirements
AMPS/DAMPS Configurations CDPD Configuration
FCC Part 22 FCC Part 22
FCC Part 15 Ameritech CDPD Certification
IS-137 Revision A GTE CDPD Certification
Bell Atlantic Mobile / Nynex CDPD Certification
AT&T CDPD Certification
2 Hardware Requirements
2.1 Module Dimensions
The physical dimensions of the DM-15 module are as indicated in the figure shown below. The electrical
interconnection to the optional accessory board is made through vertical header pins, which are part of the
accessory assembly. Dimensions given for shield-can height and overall module thickness are approximate at
this time. Note: All dimensions are in inches.
6
Figure 2.1-1 Module Dimensions
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2.2 External Interfaces
**Warning : ESD Sensitive Devices*** Many of the pins on the external connectors interface
directly with integrated circuits within the module. Although all pins are protected against normal
ESD events, use appropriate precautions to prevent ESD damage.
2.2.1 System Connector
External interfaces to the module are made primarily through a 30-pin, standard 0.050 inch pitch,
ODU header shown below.
515-568
Figure 2.2-1 System Connector
8
Position Part Number Dim A Dim B Dim C Height in mated condition
30 515.569.035.030.050 17.78 23.58 16.51 8.3 mm
ODU MINI-FIX Mating Connectors
Position Part Number Description
30 525.060.035.030.xxx Flex Cable Socket Connector
30 515.568.730.700.000 Locking Clip, Surface Mount Header to Flex Cable Socket
30 525.031.035.030.xxx SMT Board to Board Socket Connector
Figure 2.2-2 Connector Details
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Table 1.2-1: 30-Pin System Connector Functions
Pin Signal Name Description TYPE
1 GND Chassis Ground 2 GND/AD_in Chassis Ground (optionally A/D input) -/I
3 AFMS Audio from module O
4 GND Chassis Ground 5 AGND Analog ground 6 ATMS Audio to module I
7 OUT2 * Reserved O
8 WAKE Switches the main voltage regulator on/off I
9 IN2 * Reserved I
10 OUT1 * Reserved O/I
11 VDD * Logic reference O
12 IN1 * Reserved I
13 PCMCLK PCM Clock output O
14 PCMSYNC PCM Frame sync O
15 PCMULD PCM Voice input I
16 PCMDLD PCM Voice output O
17 GND Chassis Ground 18 GND Chassis Ground 19 DCD/VppFlash Data Carrier Detect and Flash Programming Voltage Input O/I
20 REF_CLK 19.44 MHz reference clock output O
21 CTS Clear to send O
22 DTR Data Terminal Ready I
23 TD Serial data to module I
24 RTS Request to Send I
25 VCC_12V 12 vdc supply (needed only for 3 Watt burst applications) I
26 RD Serial data from module O
27 VCC_12V 12 vdc supply (needed only for 3 Watt burst applications) I
28 VCC_12V 12 vdc supply (needed only for 3 Watt burst applications) I
29 VCC_5V 6 vdc regulated supply voltage I
30 VCC_5V 6 vdc regulated supply voltage I
* Pin used for SIM Interface in GSM based products. Pin function reserved for future use by U.S.
products.
Tables 2.2-2, 2.2-3 and 2.2-4 list the pin assignments for the system connector and define the detailed
electrical characteristics for each pin.
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