Westermo MD-21 - Manual (Page 4)

Receiver 1 R+
Receiver 2 R-
Transmitter 3 T+
Transmitter 4 T-
5 Shield
10 6151-2002
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
NC 4 3
Description
Connections MD-21
Line connection
(5-Position screw-terminal)
MD-21 20mA current loop equipment
Trans-
mitter
Receiver
1
2
3
4
5
R+
R-
T+
T-
T+
T-
R+
R-
Receiver
Trans-
mitter
Shield 1)
Direction No. Description
Power connection (AC)
(3-position screw-terminal)
Line connection MD-21
Terminal connection (DCE)
(RS-232-C/V.24, 9-position D-sub female or screw-terminal)
I=input O=output. MD-21 is a DCE (Data Communication Equipment).
NC=not connected.
Screw
no.
Power
Supply
Direction 1)
Pin
no. Screw
no.
CCITT V.24
Circuit no.
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
* MD-21 115V