The “XK” command is automatically sent every 30 seconds. This is done regardless of whether an M1XEP Ethernet Module is present or not. The XK command serves two purposes.

1. It tests to see if a M1XEP Ethernet Module is connected to the Control.
2. It includes the Control’s real time clock information (current Date and Time) for general purpose use, including but not limited to clock synchronization by a third party device.

The expected response from a connected M1XEP Ethernet Module is “xk”. However, the Control does not actually care or keep track of a missing “xk” response UNLESS or UNTIL after a M1XEP Ethernet Module has been properly enrolled with the Control. This can be accomplished via the Bus Module Enrollment process (Keypad programming Menu 1) or by the RP software). Once an M1XEP has been enrolled, the Control will now begin tracking each response to an “XK” command, and it will display and log an “Ethernet Trouble” message if an “xk” response is not received within 120 seconds of the “XK” command. This response scenario is also true for alarm reporting commands “AT” and “AR”. Basically, the M1XEP will withhold sending the “xk” response if it should fail to complete an alarm or restoral transmission after 2 attempts. This allows for 1 transmission miss.

NOTE: Control Firmware Version 4.32 and after includes the M1’s real time clock information.

see

4.4.5 Ethernet Module Test (XK)