A SERVICE OF

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33
| P a g e © Adam Equipment Company 2011
10.0 RELAY
INTERFACE
The indicator is supplied with drivers to control external relays. The drivers
could be used to control a number of different relays depending upon the
users need. The relay drivers are isolated outputs requiring the use of an
external power supply for the relays. Also see section 3.4.3.
Contact Adam Equipment or your supplier for a relay interface that is
compatible with the relay drivers, however other interfaces can be used as
long as the following conditions apply.
CONNECTION
OF
RELAY
DRIVERS
The output to drive external relays is on the circuit board inside the enclosure. To
gain access you must remove the 6 screws securing the front to the rear of the case.
Pass the wires for the relays through the grommet on the rear panel. The wires will
connect to the PCB using the terminal strip P1.
ZERO
LOW
OK
HI
COM
SHIE
SEN+
EXE-
EXE+
SIG+
SIG-
SEN-
09/01/2009
AE9721 VER B
RXT
TXT
GND
BT1
C18
U5
U4
Q5
Power1
LC1
COM1
U1
P1
Relay Output
Common
High
OK
Low
Zero
RS-232 Interface
Load Cell Input
Power Connector
Battery Vin
+ - no polarity
Clock Battery
CR1220 type
The circuit to control the relays requires an external voltage compatible with the
relays used.