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1 General
VSE 002 External RS-485 Module
VVSE2/EN M/B006
3
1. General
External RS-485 Module VSE 002 is used to connect VAMP
protection relays to a RS-485 bus.
Additionally this module can be used with any device, which has a
RS-232 or TTL serial interface, when an RS-485 interface is
required.
2. Power supply
The power for the module is taken from pin 9 of the D-connector or
from an external power supply interface. There is a screw terminal
(X1, see figure 1) for connecting an external +9...12Vdc power
supply.
3. Module interface to the VAMP
relays or master device
The physical interface to the device is a 9-pin D-connector. The
signal levels may be either TTL or RS-232.
The TTL/RS-232 interface of the modules is:
Pin number
TTL mode
RS-232 mode
1
-
-
2
RXD (in)
RXD (in)
3
TXD (out)
TXD (out)
4
RTS (in)
RTS (in)
5
6
7
GND
GND
8
9
+8V (in)
+8V (in)
The active state of the RTS signal is positive
voltage (> +3V) in both TTL and RS-232 modes.