Leica tps1100 Reference Manual page 229

GeoCOM Reference Manual
- Are all communication parameters set up properly? Do both participants
share the same parameters?
- Have the serial buffer been flushed after opening the serial port? If not
and you are using the ASCII protocol then use a leading <LF> to clear
the receiver buffer. In the function call protocol you do not need to take
care of that.
- When using the ASCII protocol: Is your implementation of the protocol
flow indeed synchronous? Or are you sending requests before having
received the last reply?
- Are handshake lines for the radios set correctly?
- In case of character errors check shielding of the radio wiring and
potential buffer overflow. In case of Windows on 386 and 486
computers, check the UART type. If you do not have a UART with built
in buffers (16550 type), you may loose characters too.
GND
PC-
TxD
Appl
RxD
It may be helpful for debugging purposes to build up a special cable to monitor the
data transfers.
TPS1100 - Version 1.05
1N4148
or similar
TxD
PC/
Monitor
GND
Hardware interface
GND
RxD
TPS
TxD
B-2