Westermo MA-21 - Manual (Page 4)

10 6021-2002
Cable
42pF/m
0.3mm
2
1200
5000m
600
6000m
2400
4000m
4800
3000m
9600
500m
19200
200m
I 2 103 TD/Transmitted Data
O 3 104 RD/Received Data
I 4 105 RTS/Request To Send
O 5 106 CTS/Clear To Send
O 6 107 DSR/Data Set Ready
– 7 102 SG/Signal Ground
O 8 109 DCD/Data Carrier Detect
I 11 – AUX/Auxiliary
I 19 120 SRS/Secondary Request to Send
I 20 108/2 DTR/Data Terminal Ready
Receiver 1 R+
Receiver 2 R-
Transmitter 3 T+
Transmitter 4 T-
5 Shield
No.
1) I= Input O= Output on MA-21
Direction Description Description Direction 1)
Pin
no. CCITT V.24
Circuit no.
Connections
Line connection
(5-position screw-terminal) Terminal connection (DCE)
(RS-232-C/V.24, 25-position D-sub, female)
5
Line connection
Transmitter
Receiver
Receiver
Transmitter
Shield 1)
4
3
2
1
R+
R-
T+
T-
T+
T-
R+
R-
MA-21
Twisted pairs
20mA current loop
equipment
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
Transmission range (interface 2)
Transmission rate bit/s