Instruction manual

4. SETTING FOR COMMUNICATION
IMCB14-E1
17
4.7 RS-485 Send/Receive Process Timing
The sending and receiving of RS-485 communication is conducted through two wires; consequently,
the transmission and reception of data requires precise timing. The following processing times are
required during data send/receive.
Slave process timing
Procedure details Time (ms)
Read holding registers [03H]
Response transmission time after the
slave
receives the query message
13 ms max.
Preset single register [06H]
Response transmission time after the
slave
receives the query message
6 ms max.
Diagnostics (loopback test) [08H]
Response transmission time after the
slave
receives the query message
6 ms max.