10
6042-2002
Connections
Line connection
(5-position screw-terminal)
Direction
No.
CCITT V.11
Description
Receiver
1
A’ R+
Receiver
2B’ R–
Transmitter
3
A T+
Transmitter
4
B T–
5
Shield
I
2103
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
102SG/Signal Ground
O
8
109
DCD/Data Carrier Detect
1
20
108/2
DTR/Data Terminal Ready
Description
Terminal connection (DCE)
(RS-232-C/V.24, 25-Position D-sub, female)
I = Input O = Output on MA-42.
Direction 1)
Pin
no.
CCITT V.24
Circuit number
Line connection
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
Transmission range (interface 2)
Use twisted pair cable. Max transmission range 1200m.
(cable specifications 0.3mm
2
and capacitance 42pF/m).
The transmission range will increase if a cable with lower capacitance and larger
diameter is used.
Use shielded cable in heavy industrial environments.
4-wire
2-wire
1
2
3
4
5
3
4
5
A’
B’
A
B
A
B
A’
B’
Receiver
Receiver
A/A’
B/B’
B/B’
A/A’
Twisted pairs
Twisted pairs
MA-42MA-42
Transmitter
Transmitter
RS-422
equipment
RS-485
equipment
Transmitter/
Receiver
Transmitter/
Receiver
Shield 1)
Shield 1)
The definations R+/R–,T+/T– can be
various between different manufactures.
