Chapter 2 – Setup and Configuration
Multi-Tech Systems, Inc. MultiModem Wireless EDGE, GPRS, and CDMA Modems with GPS (S000376A)
13
Configuring the GPS Side of the MultiModem
1. Port Configuration
The GPS receiver module has two I/O ports. The table below provides the default protocols and port
configurations for the receiver, as delivered from the factory. TSIP IN/OUT is the default protocol on Port 1
and RTCM-IN and NMEA-OUT is the default protocol on Port 2.
Default Protocols and Port Configurations
Port
Input
Protocol
Default Setup
Output
Language
Default Setup
1
TSIP
Baud Rate: 9600
Data Bits: 8 Parity:
Odd Stop Bits: 1 No Flow Control
TSIP
Baud Rate: 9600
Data Bits: 8 Parity:
Odd Stop Bits: 1 No Flow Control
2
RTCM
Baud Rate: 4800
Data Bits: 8 Parity:
None Stop Bits: 1 No Flow Control
NMEA
Baud Rate: 4800
Data Bits: 8 Parity:
None Stop Bits: 1 No Flow Control
The GPS Receiver can also be configured to output TAIP messages. The standard port characteristics
for TAIP are:
•
Baud Rate: 4800
•
Data Bits: 8
•
Parity: None
•
Stop Bits:1
•
No Flow Control
GPS DB-9:
Pin 2 = Port 1 Transmit Data from GPS
Pin 3 = Port 1 Receive Data into GPS
Pin 6 = Port 2 Transmit Data from GPS
Pin 4 = Port 2 Receive Data into GPS
Pin 5 = GND
Any standard serial communications program, such as Windows Hyper-Terminal or PROCOMM, can be
used to view the NMEA or TAIP output messages. TSIP is a binary protocol and outputs raw binary
serial data that cannot be read when using Windows Terminal or PROCOMM. To view the output of the
TSIP protocol in text format, use the
iQ_CHAT
or the
iQ_Monitor
program. These programs are
included on the CD-ROM as part of the MultiModem GPS Developer’s Kit.
About iQ_Monitor and iQ_Chat Utilities
The
iQ_Monitor.exe
and
iQ_Chat.exe
files plus a Developer’s Guide entitled
Developing a Software Interface for the GPS Module in the Multi-Tech MultiModem
are included on the CD as part of the MultiModem Developer’s Kit.
iQ_Monitor
iQ_Monitor is used to verify GPS is functioning. The Developer Guide explains
how to setup and use this utility.
It is a 32-bit Windows application that interfaces with a TSIP-speaking receiver
through the GPS serial port. The program accepts TSIP reports and displays
these fields in a window:
Position, Velocity, Time, Receiver Status, and Satellite Track Status.
The program allows you to exercise some basic TSIP commands and can also
log a TSIP report in binary format for later translation.
iQ_Chat
iQ_Chat is a 16-bit DOS-based application that interfaces with the GPS receiver
through a serial port. It allows you to exercise TSIP commands, configure the
GPS receiver for NMEA or TAIP, and view NMEA or TAIP output. It also logs a
TSIP report in binary format.
