
5. ROUTER DESIGN
5.9
Interfaces description
Besides the basic version of SPECTRE v3 router there are available versions with one of
the following interfaces:
•
RS232 interface
•
RS232-RS485/422 interface
•
SWITCH interface
5.9.1
RS232 interface
This interface is physically connected on RJ45 connector. RS232 converter is protected
against overload the bus.
Figure 37: Version with RS232 interface
Connection of connector:
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 17: Connection of RS232 connector
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