User manual

ARK-3390 User Manual 12
2.3.1 ARK-3390 External I/O Connectors
2.3.1.1 COM Connector
ARK-3390 provides six D-sub 9-pin connectors, which offers RS-232/422/485 serial
communication interface ports. Default setting is RS-232, if you want to use RS-422/
485, you can find the jumper installation in Appendix.
Figure 2.2 COM connector
Table 2.1: COM Standard Serial Port Pin Assignments
RS-232 RS-422 RS-485
Pin Signal Name Signal Name Signal Name
1 DCD Tx- DATA-
2RxD Tx+ DATA+
3 TxD Rx+ NC
4DTR Rx- NC
5 GND GND GND
6DSR NC NC
7RTS NC NC
8CTS NC NC
9RI NC NC
Note! NC represents “No Connection”.
1 2 3 4 5
6 7 8 9