Symbol P370 Keyless Reference Manual page 175

Beep
3 Beeps - Lo/ MCL-Link Error
Hi/Lo
3 Beeps - Lo/ MCL-Link Error
Hi/Lo
Note: For users developing applications, these error codes are reported in System
Variable 97 immediately after the execution of the offending command (SO, SI,
NO or NI).
Table C-2. Error Beeps
Type
MCL-Link rejected the command.
MCL-Link or 123Scan did not respond. The base
may not be properly connected to the host. make
sure the RS-232 cable is properly connected and
the base is receiving power. If the problem persists,
cycle power (power off then on) to the base.
Error Indications and Beeps
Description
C-3