Watlow CLS200, MLS300 and CAS200 Manuel d'utilisateur télécharger pdf (Page 37)

Chapter 2: Modbus-RTU Protocol

Communications Speciﬁcation 31

Examples

Read Examples

The data read must be sequentially located. If you’re reading a coil

rather than a register, you must offset the address by the location of the

bit you wish to read.

Sample Packet for Host Transmission

Sample Packet for Slave Transmission

Example

Slave

Address

in Hex

Function

in Hex

Start

Address

High

in Hex

Start

Address

Low

in Hex

Number

of Points

High

in Hex

Number

of Points

Low

in Hex

CRC

High

in Hex

CRC

Low

in Hex

1. Reading

PV of loop 2

(1600),

controller 1

(single-point

read)

01 03 01 6C 00 01 45 EB

2. Reading

loops 4 and 5

heat outputs,

of controller 3

(multipoint

read)

03 03 01 D1 00 02 94 2C

3. Reading

digital input

4, controller 1

(input status

read)

01 02 03 82 00 10 D9 AA

Example

Slave

Address

in Hex

Function

in Hex

Byte

Count

in Hex

Data

in Hex

CRC

High

in Hex

CRC

Low

in Hex

1. Reading PV of loop 2 (1600),

controller 1 (single-point read)

01 03 02 3E 80 84 1B

2. Reading loops 4 and 5 (50%,

60%) outputs (heat), of controller 3

(multipoint read)

03 03 04 3F DE 4C 4A 2D 41

3. Reading digital input 4, controller

1 (input status read)

01 02 02 08 00 BE 78

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 91 92

Commentaires sur ces manuels

Pas de commentaire

Watlow CLS200, MLS300 and CAS200 Manuel d'utilisateur Page 37

Commentaires sur ces manuels

Produits connexes et manuels pour Capteurs Watlow CLS200, MLS300 and CAS200