Acrosser AR-B1551 - Manual (Page 24)

AR-B1551 User’s Guide
22
3.2.18 COM1, COM2 (COM1, COM2 )
COM1 (COM1) COM2 (COM2)
9
8
7
6
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
Figure 0-6 COM1 & COM2: RS-232 Connector
CN5 CN6 Signal CN5 DB6 Signal
1 1 /DCD 6 6 /CTS
2 2 /DSR 7 7 /DTR
3 3 RXD 8 8 /RI
4 4 /RTS 9 9 GND
5 5 TXD 10 -- GND
Table 0-3 RS-232 Connector Pin Assignment
(1) RS-232/RS-485 Select for COM2 (P1 & P3)
The P1&P3 jumper is used to choose between the use of the on-board RS-232 or RS-485 for the COM2.
P3
P1 1
3
2
RS-232
Factory Preset
1
3
2
RS-485
A C B A C B
Figure 3-10 P1 & P3: RS-232/RS-485 Select for COM2
(2) RS-485 Terminator Select (JP6)
When there is only one line the setting should be left off, but if you are using multiple blocks on a single line
this should be set to “ON” in order to properly terminate the connection for better transmission of data
OFF
Factory Preset
1
2 1
2
ON
Figure 0-7 JP6: RS-485 Terminator Select