Westermo ED-20 User Manual
Page 10
Pin
Signal Name*
Direction**
Description
Number
Description
V.24
RS-232C
1DCD
1
09
CF
–
Data Carrier Detect, NC
2
RD
104
BB
Out
Received Data
3
TD
103
BA
In
Transmitted Data
4
DTR
108.2
CD
–
Data Terminal Ready, NC
5
SG
102
AB
In/Out
Signal Ground
6
DSR
107
CC
–
Data Set Ready, NC
7
RTS
105
CA
In
Request to Send, NU
8
CTS
106
CB
Out
Clear to Send, NU
9
RI
125
CE
–
Ring Indicator, NC
Pin
Signal Name*
Direction**
Description
Number
Description
V.24
RS-232C
1DCD
1
09
CF
Out
Data Carrier Detect
2
RD
104
BB
Out
Received Data
3
TD
103
BA
In
Transmitted Data
4
DTR
108.2
CD
In
Data Terminal Ready
5
SG
102
AB
In/Out
Signal Ground
6
DSR
107
CC
Out
Data Set Ready
7
RTS
105
CA
In
Request to Send
8
CTS
106
CB
Out
Clear to Send
9
RI
125
CE
–
Ring Indicator, NC
CH1: RS-422 Connections (Upper left screw terminal)
* Numbered right to left (front view).
** Direction relative ED-20.
Twisted pair cable is recommended
10
6609-2222
CH1: RS-232 Connections, DCE
* Functionality might differ from standard
** Direction relative ED-20
NC Not connected
CH2: RS-232 Connections, DCE
* Functionality might differ from standard
** Direction relative ED-20
NC Not connected
NU Not used
1
2
3
4
5
6
7
8
9
5
4
3
2
1
9
8
7
6
5
4
3
2
1
Terminal
Signal Name*
Number
Marked on
According
ED-20
to Standard
Direction**
Description
1SG
–
–
Not connected
2
T–
B
Out
RS-422 4-wire Transmitter
3
T+
A
Out
RS-422 4-wire Transmitter
4
R–
B’
In
RS-422 4-wire Receiver
5
R+
A’
In
RS-422 4-wire Receiver