Acrosser AR-B1790 - Manual (Page 14)

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3.4 COM4 RS-232/RS-485 SELECT (JP21, JP22)
•
RS-485 Terminator Select (JP16)
JP16 (ON)
•
RS-485 Header (JP17)
1
2
3
3.5 PS2 KEYBOARD & MOUSE (PS/1)
The AR-B1790 provides 6-PIN JST Header and 6-PIN MINI-DIN keyboard/mouse connector.
PS2 M ouse
PS2 K eyB oard
P S /1
7 8
9 10
11 12
1 2
3 4
5 6
JUMPER FUNCTION
JP21
1
3
5
1
2
3
JP22
RS-485
JP21
1
3
5
1
2
3
JP22
RS-232
FACTORY PRESET
PIN Signal
1 N485+
2 N485-
3 GND
PIN Signal
1 KBDATA
2 NC
3 GND
4 VCC
5 KBCLK
6 NC
7 MSDATA
8 NC
9 GND
10 VCC
11 MSCLK
12 NC
FACTORY PRESET
* When there is only one line the setting should be left off (please
take off the jumper), if multiple blocks are used on a single line this
should be set to “ON”(place a jumper) in order to properly terminate
the connection for better transmission