Westermo MD-44 - 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.