Product Manual

6 | P a g e © Adam Equipment Company 2010

3.4.2 CONNECTION OF RS-232

RS-232 serial interface is a plug as figure 2 shows:

1: Pin GND, Signal Ground

2: Pin RXD, Received Data

3: Pin TXD, Transmitted Data

As viewed from the back of the indicator

See section 9 for details of the RS-232 Interface.

3.4.3 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

COM

SHIE

SEN+

EXE-

EXE+

SIG+

SIG-

SEN-

09/01/2009

AE9721 VER B

RXT

TXT

GND

BT1

C18

Power1

LC1

COM1

Relay Output

Common

High

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. For more information see section 10.