IBASE SI-28 User Manual
Page 17
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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
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