Acrosser AR-B1320 - Manual (Page 28)

A A R R - - B B 1 1 3 3 2 2 0 0 U U s s e e r r ’ ’ s s G G u u i i d d e e
3-8
3.11.1 RS-232C CONNECTORS (CN3 & CN4)
CN3 is the RS-232C- interface connector of COM-A port and CN4 is the RS-232C connector for
the COM-B port. They are both 10-pin 2.54mm right angle headers. AR-B1320 provides 2
adapter cables to transfer to the PC/AT standard connector (DB9 male). The next figure and table
show the pin definitions of the adapter cable:
Figure 3-9 CN3 & CN4: RS-232C Connector
CN3 & CN4 Function DB9 Male
Pin 1 -DCD Pin 1
Pin 2 -DSR Pin 6
Pin 3 RXD Pin 2
Pin 4 -RTS Pin 7
Pin 5 TXD Pin 3
Pin 6 -CTS Pin 8
Pin 7 -DTR Pin 4
Pin 8 -RI Pin 9
Pin 9 GND Pin 5
Pin 10 Case Ground Case
Table 3-6 CN3 & CN4 Pin Assignments
3.11.2 RS-485 CONNECTOR (CN5)
CN5 is used to connect the RS-485 interface of COM-A port and COM-B port. It’ s pin
assignments are shown below.
Figure 3-10 CN5: RS-485 Connector
DB9 Male
9 6
5 1
1
Front View
10 2
9
CN3 &
CN4
1
2
5
6
Front View
1: 485+ (COM-A)
3: 485- (COM-A)
5: Case Ground (COM-A)
2: 485+ (COM-B)
4: 485- (COM-B)
6: Case Ground (COM-B)