Connections md-42, Line connection – Westermo MD-42 User Manual
Page 4
10
6152-2002
N
115V*/230V
L
AC power
PE/Protective Earth
I
3
8
103
TD/Transmitted Data
O
2
7
104
RD/Received Data
I
7
6
105
RTS/Request To Send
O
8
5
106
CTS/Clear To Send
O
6
2
107
DSR/Data Set Ready
–
5
9 & 1
102
SG/Signal Ground
O
1
4
109
DCD/Data Carrier Detect
I
4
3
108/2
DTR/Data Terminal Ready
Description
Connections MD-42
Line connection
(5-Position screw-terminal)
Direction
No.
Description
Receiver
1
A’
(R+)
Receiver
2
B’
(R–)
Transmitter
3
A
(T+)
Transmitter
4
B
(T–)
5
Shield
Power connection (AC)
(3-position screw-terminal)
Terminal connection (DCE)
(RS-232-C/V.24, 9-position D-sub, female/screw-terminal)
I = Input O = Output on MD-42
* MD-42 115V only
Screw
no.
Power
Supply
Drection
Pin
no.
Screw-
terminal
CCITT V.24
Circuit no.
Line connection
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
4-wire
2-wire
1
2
3
4
5
3
4
5
A’
B’
A
B
A
B
A’
B’
Receiver
Receiver
A/A’
B/B’
B/B’
A/A’
Twisted pairs
Twisted pairs
MD-42
MD-42
Transmitter
Transmitter
RS-422
equipment
RS-485
equipment
Transmitter/
Receiver
Transmitter/
Receiver
Shield 1)
Shield 1)
The definations R+/R–,T+/T– can be
various between different manufactures.