CHAPTER 13 RS-485 COMMUNICATIONS

5-2. Monitoring cycle

A communications cycle example for writing the CONT signal to read monitored data is shown as

a communication method for starting operation and monitoring the state. The example assumes a

communications baud rate of 38400 bps and 11-bit characters.

Master

Amplifier

5 ms

5 ms

Communication CONT signal write

01 10 0000 0002 04 0000**** **** (13 bytes)

3.7 ms

01 10 0000 0002 41C8 (8 bytes)

2.3 ms

Monitor data read (2 pcs.)

01 03 1006 0004 A0C8 (8 bytes)

01 03 08 ******** ~ **** (13 bytes)

2.3 ms

3.7 ms

5 ms

5 ms

Cycle

32 ms

5 ms

Communication CONT signal write

01 10 0000 0002 04 0000**** **** (13 bytes)

3.7 ms

01 10 0000 0002 41C8 (8 bytes)

2.3 ms

5 ms

13

13-38 Modbus RTU Communications