Connections md-44 ac, Line connection (5-position screw-terminal) – Westermo MD-44 User Manual
Page 4
10
6155-2002
Connections MD-44 AC
Line connection
(5-position screw-terminal)
CCITT V.11
Direction
No.
Description
Receiver
1
A’ (R+)
Receiver
2B’ (R–)
Transmitter
3
A
’
(T+)
Transmitter
4
B
’
(T–)
5
Shield
Terminal connection (DCE)
(RS-232-C/V.24/V.28, 9-position D-sub, female)
Line connection
Direction 1)
Pin
Screw-
CCITT V.24
Description
no.
terminal
Circuit number
I
3
8
103
TD / Transmitted Data
O
27
104
RD / Received Data
I
7
6
105
RTS / Request to Send
O
8
5
106
CTS / Clear to Send
O
6
2107
DSR / Data Set Ready
–
5
9 & 1
102SG / Signal Ground
O
1
4
109
DCD / Data Carrier Detect
I
4
3
108/2DTR / Data Terminal Ready
1) I = input
O = output on MD-44
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
4-wire
MD-44
RS-422/485
equipment
RS-422/485
equipment
Transmitter/
Receiver
Transmitter/
Receiver
Twisted pairs
Twisted pairs
Receiver
Transmitter
Transmitter
Receiver
A’
B’
A
B
A
B
A’
B’
Shield 1)
Shield 1)
A/A’
A/A’
B/B’
B/B’
1
2
3
4
5
3
4
5
MD-44
2-wire
The definations R+/R–,T+/T– can be various between
different manufactures.