8.4 Serial communication connection
8 Connections
Technical description
196
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VM50.EN004
8.4.
Serial communication connection
The device can be equipped with optional communication
module. The physical location of the module is the lower option
card slot at the back of the relay. The modules can be installed
in the field (when power is first turned off).
There are three “logical communication ports” available in the
relay: REMOTE, LOCAL and EXTENSION. Depending on the
module type one or more of these ports are physically available
at the external connectors.
8.4.1.
Pin assignments of communication options
The communication module types and their pin assignments
are introduced in the following table.
Type
Communication
ports
Signal
levels
Connectors Pin
usage
REMOTE RS-232
EXTENSION RS-232
D-connector 2 = TX_REM
3 = RX_REM
5 = TX_EXT
6 = RX_EXT
7 = GND
9 = +12V
RS-232 +
Ethernet
Ethernet Ethernet
RJ-45
1=T
2=Transmit-
3=
4=Reserved
5=Reserved
6=Receive-
7=Reserved
8=Reserved
REMOTE
RS-485 (2-
wire)
3-pole screw
connector
1= -
2= +
3= GND
Option: IRIG-B
TTL
2-pole screw
connector
1= Data
2= GND
Option: RTD fiber
input
Light
Snap-in
connector
RS-485 +
option
Option: Ethernet
Ethernet
RJ-45
1=T
2=Transmit-
3=
4=Reserved
5=Reserved
6=Receive-
7=Reserved
8=Reserved