JHCTech PMI-3110, User Manual

Page: 19 / 39

User’s Manual
12
Figure 2.12 USB connector
Table 2.4: USB Connector
Pin Signal name
1 VCC
2 USB_P0
3
4 GND
2.4.4 COM1 Connector
The PMI-3110 provides a D-sub 9-pin connector, which offers a RS-232/485 serial communication interface
port of COM1. The default setting of COM1 is RS-232. Please refer to Table 2.5 for their pin assign-ments
and jumper settings for setting up RS-485.
1 2 3 4 5
6 7 8 9
Figure 2.13 COM3/COM4Connector
RS-232 RS-485
Pin Signal Name Signal Name
1 DCD DATA-
2 RxD DATA+
3 TxD NC
4 DTR NC
5 GND GND
6 DSR NC
7 RTS NC
8 CTS NC
9 RI NC
Note: NC represents —No Connection“
2.4.5 COM2 Connector
The PMI-3110 provides a RS-232 ports by a D-sub 9-pin connectors. Please refer to Table 2.6 for their pin
assignments.