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The RxD (card output) and TxD (card input) lines are defined in respect to the connected device. So the USC-3 RxD pin should be connected to the device RxD pin and the same for the TxD pins. The baud rate can be defined between 2400 and 115200.
The Tx and Rx pins are already crossed internally on the USC board. Connect RxD to RxD and TxD to TxD. |
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The RS-232 default settings are:
Description |
Default value |
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DataLength |
8 |
Stop Bits |
1 |
Parity |
none |
Baud rate |
115200 |
Flow control |
none |
Table 30: RS-232 default settings
Available baud rates are 2400, 4800, 9600, 19200, 38400, 57600 and 115200. It can be changed with the SBR command.
The USC-3 gets the RS-232 commands over the 37-pin connector. The pin 32 (RS-232_Out) should be connected to the device RxD pin and the pin 33 (RS-232_In) should be connected to the TxD pin of the device. A typical connection between a standard 9-pin RS-232 connector like used with a PC is shown below.
Figure 20: RS-232 pin assignment for a 1:1 cable (not crossed)