IBASE SI-28 - Manual (Page 17)

17
JP4, JP5, JP6: RS232/422/485 (COM2) Selection
COM1 is fixed for RS-232 use only. COM2 is selectable for RS232, RS-422 and
RS-485. The following describes the settings for COM2.
COM2
Function
RS-232 RS-422 RS-485
Jumper
Setting
(pin closed)
JP4:
1-2
JP5:
3-5 & 4-6
JP6:
3-5 & 4-6
JP4:
3-4
JP5:
1-3 & 2-4
JP6:
1-3 & 2-4
JP4:
5-6
JP5:
1-3 & 2-4
JP6:
1-3 & 2-4
Pin # Signal Name
RS-232 R2-422 RS-485
1 RTS NC NC
2 DTR RX- NC
3 TXD RX+ NC
4 GND GND GND
5 DCD TX- DATA-
6 RXD TX+ DATA+
7 DSR NC NC
8 CTS NC NC
CN2
JB1: Clear CMOS Setting
JB1 Setting Setting
Pin 1-2
Short/Closed
Normal
Pin 2-3
Short/Closed
Clear CMOS