5. USER INTERFACES
5.11
Expansion Ports Information
5.11.1
RS-232 Ports
The RS-232 port is configured as a Data Communication Equipment (DCE). The interface
is connected to RJ45 connector PORT1 or PORT2 (based on the router model number). An
adapter cable can be used to convert RJ-45 connector to a standard DB9 serial connector.
The RS-232 port is protected against bus overload.
Figure 21: RS-232 port connector
Panel socket RJ45 (RS-232 – DCE – Data Communication Equipment)
Pin
Signal
Description
Direction
1
RTS
Request To Send
Input
2
CTS
Clear To Send
Output
3
DTR
Data Terminal Ready
Input
4
DSR
Data Set Ready – connect to +3 V through R 330 Ohm
Output
5
GND
Signal ground
6
TXD
Transmit Data
Output
7
CD
Carrier Detect
Output
8
RXD
Receive Data
Input
Table 18: Connection of RS-232 connector
Example of connecting a meter to the router:
Figure 22: Meter connection to router
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