Watlow CLS200, MLS300 and CAS200 User Manual download pdf (Page 38)

32 Communications Speciﬁcation

Chapter 2: Modbus-RTU Protocol

Write Examples

The data written is echoed back to the controller.

Sample Packet for Host Transmission, a Single-Point Write

Sample Packet for Slave Transmission, a Single-Point Write

Example

Slave

Address

in Hex

Function

in Hex

Address

High

in Hex

Address

Low

in Hex

Data

High

in Hex

Data

Low

in Hex

CRC

High

in Hex

CRC

Low

in Hex

4. Writing loop 1

gain (20),

controller 4

(single-point

write)

04 06 00 00 00 14 89 90

5. Writing

digital output 30

(on), controller 2

(single coil

write)

02 05 03 A8 FF 00 0D AD

Example

Slave

Address

in Hex

Function

in Hex

Address

High

in Hex

Address

Low

in Hex

Data

High

in Hex

Data

Low

in Hex

CRC

High

in Hex

CRC

Low

in Hex

4. Writing loop 1

gain (20),

controller 4

(single-point

write)

04 06 00 00 00 14 89 90

5. Writing

digital output 30

(on), controller 2

(single coil

write)

02 05 03 A8 FF 00 OD AD

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 91 92

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Watlow CLS200, MLS300 and CAS200 User Manual Page 38

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