Avery Weigh-Tronix PC-805, Service Manual

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The error messages you might see on the display are shown below.
EPr Err EEPROM error - press the TARE key to acknowledge the error
CAL Err Calibration error - perform calibration procedure to correct
Lo Bat Low battery voltage - this annunciator will appear when battery
voltage reaches 11.5 volts. The scale will shut off at 10 volts.
Pinout assignments for the serial communication are shown below.
9-pin Female
Scale
Pin Name Direction
2 TXD OUT
3 RXD IN
5 SG -
Error Messages
Serial Communications
Cable Pinouts
A straight through cable (1 to 1,
2 to 2, etc.) can be used from a
9-pin computer serial port to
connect this scale.