CHAPTER 6
CABLING INFORMATION


Two special cables with a DB37 connector are provided in the package. This cable converts the signals from the DB37 connector into two standard DB25 connectors.



DB37
Pin#
Channel
Signal Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
 -
1
1
1
1
1
1
1
1
1
Ground
Transmit Data (+)
Receive Data (+)
Request to Send (+)
Clear to Send (+)
Data Set Ready (+)
Ground
DCD (+)
Dtat Terminal Ready (-)
Ring Indiccator (-)
Transmit Data (+)
Receive Data (+)
Request to Send (+)
Clear to Send (+)
Data Set Ready (+)
Ground
DCD (+)
Data Terminal Ready (-)
Ring Indicator (-)
Transmit Data (-)
Receive Data (-)
Request to Send (-)
Clear to Send (-)
Data Set Ready (-)
DCD (-)
Data Terminal Ready (+)
Ring Indicator (+)
Ground
Ground
Transmit Data (-)
Receive Data (-)
Request to Send (-)
Clear to Send (-)
Data Set Ready (-)
DCD (-)
Data Terminal Ready (+)
Ring Indicator (+)


6.1 RS422 Cabling Information

The signal assignments for a standard DB25 connector are shown as follows.

Pin
Name
Description
1
2
3
4
5
6
7
8
9
10
14
15
16
17
18
19
20
22
GND
TX+
RX+
RTS+
CTS+
DSR+
GND
DCD+
DTR -
RI -
TX -
RX -
RTS -
CTS -
DSR -
DCD -
DTR+
RI+
Ground
Transmit Data (+)
Receive Data (+)
Request to Send (+)
Clear to Send (+)
Data Set Ready (+)
Ground
Data Carrier Detect (+)
Data Terminal Ready (-)
Ring Indicator (-)
Transmit Data (-)
Receive Data (-)
Request to Send (-)
Clear to Send (-)
Data Set Ready (-)
Data Carrier Detect (-)
Data Terminal Ready (+)
Ring Indicator (+)


6.2 RS422 Cabling Connections

To connect RS422 ports to other DATA TERMINAL EQUIPMENT (DTE) devices, we recommend the use of DTE to DTE configuration which is shown as follows.

HOST
PC RS422
REMOTE
PC RS422
GND
TX+
RX+
RTS+
CTS+
TX -
RX -
RTS -
CTS -
GND
RX+
TX+
CTS+
RTS+
RX -
TX -
CTS -
RTS -


6.3 RS485 Cabling Information

The RS485 signal assignment is shown as follows.

Pin
Name
Description
1
2
3
14
15
GND
TX+
RX+
TX -
RX -
Ground
Transmit Data (+)
Receive Data (+)
Transmit Data (-)
Receive Data (-)


The RS485 communication is based on cable sharing method which is connected as following:

Computer at site 1
Computer at site 2
TX+, RX+
TX -, RX -
Ground
TX+, RX+
TX -, RX -
Ground