I have many meters on the same picture screen and receive #COM randomly?

The Citect driver supports multitelegram, and if you have a multi telegram meter like the Armatec or F4 from Metrima connected they will read all the telegrams from the meters. The everyday information is normally to be found in telegram 1, and if that is the only information needed set the parameter NrOfTelegrams=1, which means that only telegram number 1 will be read. By doing this the stress on the M-Bus loop will be noticeably reduced.