Setup guide

Dedicated Micros ©2007
17
BX2
RS232
Data Carrier Detect (DCD)
Receive Data (RX)
Transmit Data (TX)
Data Terminal Ready (DTR)
Ground (GND)
Data Set Ready (DSR)
Ready To Send (RTS)
Clear To Send (CTS)
Ring Indicate (RI)
1
2
3
4
5
6
7
8
9
-
2
3
-
5
-
7
8
-
Serial 1 & 2
Pin Allocation
Serial 3 & 4
Pin Allocation
RS-2
32
RS422
R
S
-4
22
Transmit Data (TX+)
Transmit Data (TX-)
Receive Data (RX+)
Receive Data (RX-)
1
9
4
6
Serial 3 & 4
Pin Allocation
RS485
RS-48
5
Transmit Data (TX+)
Transmit Data (TX-)
1
9
Serial 3 & 4
Pin Allocation
Note: The screen from the cable should be connected to the unit frame.
The RS485 conguration is a bus topology, the maximum distance between the initial piece of equipment and
the last piece is 1200 meters (4000 feet), this distance must not be exceeded. The bus should be terminated at
each end with 120 Ω resistance.
Important notice regarding EMC compliance - Use only screened cables when connecting to the Serial Port(s) of
this equipment. The screen should be connected to the chassis of the unit.
Termination Dip Switches
The termination dip switches ensure the termination on the serial ports is correct. When connecting 485-Bus,
RS-422 and RS-485 serial devices to the unit, it is important that the dip switches are set as follows: