GridConnect CAN USB-232, User Manual

Page: 59 / 65

Getting Started
CAN USB-232 User Manual 2-51
2.14 Serial Number in Command Mode
You can enable and configure the CAN port side to respond to CAN requests for the serial number.
2.14.1 get sernumcmd cm
Gets the current 128-bit serial number in command mode.
2.14.2 set sernumcmd cm enable
Enables or disables the command mode serial number command.
There are three identifiers that can be specified:
The RX identifier to listen for (either DATA or RTR
The TX identifier for the first 64-bits of the 128-bit serial number
The TX identifier for the second 64-bits of the 128-bits serial number
This feature can be enabled/disabled/defined from within CONFIG mode.
If enabled, it is only active when in CM mode. In VC mode, it is automatically disabled.
Operation when enabled:
Received CAN messages are compared against the RX identifier specified during configuration. If there is a
match (ID, type, RTR, etc.), then the unit will respond with two CAN messages using the two TX identifiers
defined during configuration.
The identifiers can be all the same or different, so long as they respect the rules of the CAN bus protocol.
For example, do not attempt so send two CAN identifiers with the same ID at the same time (unless at least
one of them is RTR).
This allows the end-user to query the CAN device in a system and determine its presence.
Example #1
Three units are configured to have the same RX identifier in RTR mode. Each units as unique TX
identifiers. When a node on the network issues a RX identifier request for serial numbers, the three units
will all transmit their respective serial number messages.