Westermo MD-45 AC Manuel D'installation page 10

Connections MD-45 AC
Line connection
(5-position screw-terminal)
Direction
Receiver
Receiver
Transmitter
Transmitter
The definitions R+/R–,T+/T– can be various between
different manufactures.
Terminal connection (DCE)
(RS-232-C/V.24, 9-position D-sub, female)
Direction
I
O
I
O
O
–
O
I = input O = output on MD-45
Line connection
4-wire
MD-45 Twisted pairs
1
Receiver
A'
2
B'
3
Transmitter
A
4
B
Shield *)
5
*) If shielded cable is used, connect the shield only at one end to avoid ground currents.
10
Pin ITU-T V.11
no. Description
1 A' (R+)
2 B' (R–)
3 A' (T+)
4 B' (T–)
5 Shield
Pin Screw-
no. terminal
3 8
2 7
7 6
8 5
6 2
5 9 & 1
1 4
RS-422/485
equipment
A Transmitter
B
Receiver
A'
B'
ITU-T V.24 Description
Circuit number
103 TD / Transmitted Data
104 RD / Received Data
105 RTS / Request to Send
106 CTS / Clear to Send
107 DSR / Data Set Ready
102 SG / Signal Ground
109 DCD / Data Carrier Detect
2-wire
MD-45
Twisted pairs
3
Transmitter/
A/A'
4
Receiver
B/B'
Shield *)
5
RS-422/485
equipment
Transmitter/
A/A'
Receiver
B/B'
6157-2001