Communication Timing - Weidmuller Power Monitor Handbuch

Communications
9.2

Communication timing

• The minimum access time from the Master is 1 sec. (Minimum time to update the data)
Power Monitor may not response due to noise etc., check that it receives the response from Power
Monitor.
• In order to improve the communication quality, we recommend that you send the transmission again.
Communication timing of RS485
• Power Monitor (Slave) side
When Power Monitor (Slave) starts transmission to the RS485 communication line, it is arranged so as to
provide an idle status transmission period of about 1 to 99 ms (setting available) before sending the
response to ensure the synchronisation on the receiving side. After sending the response, the Master can
disconnect the transmitter from the communication line within a transmission period of 20 ms.
• Master side (Cautions of setting a program)
During communication, ensure that the following conditions are observed.
(1) Set the program so that the Master can disconnect the transmitter from the communication line within
the transmission period of about 20 ms after sending the command in preparation for reception of the
response from Power Monitor (Slave).
(2) To avoid collision of transmissions between the Master and Power Monitor (Slave), send the next
command after checking that the Master has received the response.
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