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▍ Hardware Setup<br />
▶ COM1: RS-232/422/485 Serial Port (Optional)<br />
The serial port is a 16550A high speed communications port that sends/<br />
receives 16 bytes FIFOs. You can attach a serial mouse or other serial<br />
devices directly to the connector.<br />
RS-232<br />
PIN SIGNAL DESCRIPTION<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
9<br />
DCD<br />
RXD<br />
TXD<br />
DTR<br />
GND<br />
DSR<br />
RTS<br />
CTS<br />
VCC_COM1<br />
Data Carrier Detect<br />
Receive Data<br />
Transmit Data<br />
Data Terminal Ready<br />
Signal Ground<br />
Data Set Ready<br />
Request To Send<br />
Clear To Send<br />
Voltage select setting by jumper<br />
RS-422<br />
PIN SIGNAL DESCRIPTION<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
9<br />
422 TXD-<br />
422 RXD+<br />
422 TXD+<br />
422 RXD-<br />
GND<br />
NC<br />
NC<br />
NC<br />
NC<br />
Transmit Data, Negative<br />
Receive Data, Positive<br />
Transmit Data, Positive<br />
Receive Data, Negative<br />
Signal Ground<br />
No Connection<br />
No Connection<br />
No Connection<br />
No Connection<br />
RS-485<br />
PIN SIGNAL DESCRIPTION<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
9<br />
485 TXD-<br />
NC<br />
485 TXD+<br />
NC<br />
GND<br />
NC<br />
NC<br />
NC<br />
NC<br />
Transmit Data, Negative<br />
No Connection<br />
Transmit Data, Positive<br />
No Connection<br />
Signal Ground<br />
No Connection<br />
No Connection<br />
No Connection<br />
No Connection<br />
2-6
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