MoTeC PLM - Manual (Page 26)

26 PLM Communications
Messages 2 to 4 are not required and should be “OFF” on the slave units.
The Collect Master message rate must be set to OFF on the slave units.
A PLM configured as a slave unit will briefly display the PLM unit number (eg “U
4” for PLM 4) on start-up after displaying the firmware version.
Appendix O – Recommended CAN Collect Configuration describes the
recommended configuration for connecting multiple PLM units to an ADL.
CAN Unit Number Display
On power-up, a PLM will display a unit number based on the current CAN
communications configuration. This unit number is displayed for one second
after the firmware version has been displayed. The unit number is useful for
trouble shooting systems containing multiple PLMs.
The unit number displayed is based on whether the unit is a Collect Master, and
on the least significant digit of the CAN address specified for CAN Message 1,
as shown below.
Display PLM Number Configuration
U 0 PLM 0 Collect Master disabled
Message 1 disabled (Message Rate = Off)