INSYS MRX DSL, Installation And User Manual

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Technical Information SCR
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7.5 RS232 interface
Figure 6: SCR – RS232 interface connection
Connector Signal Description
1 DCD Data Carrier Detect
2 RXD Receive Data
3 TXD Transmit Data
4 DTR Data Terminal Ready
5 GND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indication
Table 1 0: SCR – RS232 interface connection

The RS232 interface conforms to the layout as DTE (Data Terminal
Equipment)
7.6 Connecting the connectors
The wires are contacted in the connector via screw terminals. The tightening
torque is 0.5
– 0.6 Nm.
The permissible wire cross-sections can be found in the following table.
Wire Cross-section
Nominal cross-section 1.5 mm²
Rigid 0.2 – 1.5 mm²
Flexible 0.2 – 1.5 mm²
Flexible with end sleeve 0.25 – 1.5 mm²
Table 1 1: Permissible wire cross-sections for connectors
7.7 Maximum line lengths
The maximum line lengths to the connections can be found in the following table.
Wire Max. length
Antennas, power supply, serial interfaces, inputs and outputs,
other signals 30 m
Table 1 2: Permissible line lengths