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The comms connector is a standard DB9. It provides an RS232 compatible interface, and is used for communications with a PC for programming and use with SPLatLink.
The RS232 interface is a basic interface with transmit data, receive data and ground. Pinouts are as follows:
Pin |
Signal name |
Comments |
1 |
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2 |
RxD |
Serial data output from board |
3 |
TxD |
Serial data input to board |
4 |
DTR |
Permanent +5V via 2.2K (output) |
5 |
Gnd |
0V, signal ground |
6 |
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7 |
RTS |
Request to Send signal out of board |
8 |
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9 |
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The interface has a special design that allows several boards' interfaces to be connected in parallel, like pin to like pin. This makes possible small systems of up to 5 boards in a multi-drop communications configuration, connected perhaps to a shared modem. Please contact SPLat Controls for information about suitable firmware to support this arrangement.
See also RS232 pinouts: A primer
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