Specifications

88 Chapter 6 - Command Reference
Key ('K','k') - Serial Controllers Only
Function: Used to set or query the Key Byte value. The Key Byte may be
used for multiplexing multiple controllers on a common serial line.
The KeyValue byte may be from 1 255. A null value disables this function.
When the Key command is issued, the Acknowledge packet and all subsequent
packets will be in the new format.
Keyed packets are disabled by factory default.
Keyed packets are discussed on page 52.