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6.- WIRING
6.1.- POWER SUPPLY, RECOMMENDED WIRING
6.2.- PROTECTION FUSES
The unit has a protection fuse located on the power supply
socket.
If this fuse must be replaced or changed because the power
supply is changed, use the time-lag fuse according to IEC 127/
2 with the values indicated on the table.
6.3.- SIGNAL INPUT CONNECTION
The serial ASCII input circuit can be set to one of 10 arrangements. Unless otherwise specified at the time of
order, the input circuit will be factory default set for RS-232 levels. If you are in any doubt about the input condi-
tions, it is advisable to remove the rear panel of the unit and inspect the internal jumper switch positions.
The operating mode of the unit and baut rate are, unless otherwise specified at the time of order, set for the
default settings of :
MODE : strobed display
If you are in any doubt about these settings, they can be determined by powering up the unit with the input line
idle, and observing the display at power-up.
To change any set-up conditions see the configuration section
1
2
3
N/C
Signal connections are different for different input configurations. They are as follows :
Signal Input
Type
RS-232 ±15 V
RS-422/RS-485
Internal Load
RS-422/RS-485
External Load
RS-423 ±5 V
2 mA Loop Powered
20 mA Loop Powered
TTL Level
Power switch
FUSE and spare fuse.
BAUD : 1200
Connections are : 4 way pin connection.
Pin 1 = Signal B
Pin 2 = Signal A
Pin 3 = Signal common
Pin 4 = Not used.
Signal Input Connector
Pin 1
Input
Signal B
Signal B
Input
Loop -
Loop +
Loop -
Loop +
+5 V
POWER SUPPLY
115 Vac (230 Vac Optional).
ADDRESS : 0
Note : Signal common should be grounded
to system common.
Pin 2
Pin 3
+5 V
GND
Signal A
GND
Signal A
GND
+5 V
GND
Loop +
not used
(Loop internally powered)
not used
Loop -
(Loop externally powered)
Loop +
not used
(Loop internally powered)
not used
Loop -
(Loop externally powered)
Input
GND
Power
Fuse
Supply
value
230 Vac
0.2 A
115 Vac
0.4 A
BITS : 8
PARITY : none
Page : 8
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