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3-2 Lassen-SK8 Embedded GPS Module
Software Interface
3.3 Communicating with the Lassen-SK8 Module
The Lassen-SK8 supports three I/O message protocols: TSIP, TAIP, and NMEA. The
protocols are discussed at the end of this chapter, and are explained in detail in
Appendices A through E.
Communication with the Lassen-SK8 module is through two CMOS compatible, TTL
level serial ports. The port characteristics can be changed to accommodate your
application requirements. Port parameters are stored in a non-volatile electrically erasable
ROM (EEROM) that does not require backup power. Table 3-1 lists the default
characteristics for each port.
Any standard serial communications program, such as Windows Terminal or
PROCOMM, can be used with the TAIP or NMEA interface protocol. TSIP is a binary
protocol and outputs raw serial data onto the screen which cannot be read. Trimble
encourages the use of the DOS compatible software tool kit provided for TSIP. The serial
port drivers in the Trimble tool kit, TSIPCHAT, match the Lassen-SK8 serial port
characteristics. The TSIPPRNT program converts binary data logged with the TSIPCHAT
program into ASCII characters that may be printed and displayed.
M
Warning – When using the TSIP protocol to change port assignments or characteristics,
confirm that your changes do not affect the ability to communicate with the receiver
module.
Table 3-1. Default Serial Port Characteristics
Port
Input
Protocol Default Setup
Output
Language Default Setup
1 TAIP Baud Rate: 4800
Data Bits: 8
Parity: Odd
Stop Bits: 1
No Flow Control
TAIP Baud Rate: 4800
Data Bits: 8
Parity: Odd
Stop Bits: 1
No Flow Control
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