Watlow CPC400 Manual de usuario descargar pdf (Pagina 208)

Appendix A: Modbus Protocol CPC400 Series User’s Guide

194 Watlow Anafaze Doc. 0600-2900-2000

Write Examples

The data written is echoed back to the controller. The fol-

lowing examples show sample query and response packets.

Example 1

The host query (Table A.5 on page 194) uses the multiple-

point write function to write a value of 20 to the proportion-

al band for loop 1 in a controller with address 1. The slave

responds (Table A.6 on page 194).

Table A.5 Sample Packet for Host Query

Table A.6 Sample Packet for Slave Response

Example 2

The host query (Table A.7 on page 194) uses the multiple-

point write function to write the values 30, 40, and 50 to the

proportional bands for loops 1 through 3 in a controller

with address 1. The slave responds (Table A.8 on page 194).

Table A.7 Sample Packet for Host Query

Table A.8 Sample Packet for Slave Response

Slave Address Function

Start Address Data

CRC

High Low High Low

04 06 00 00 00 14 89 90

Slave Address Function

Start Address Data

CRC

High Low High Low

04 06 00 00 00 14 89 90

Slave

Addr.

Func-

tion

Start

Address

No. of

Registers

Byte

Count

Data 1 Data 2 Data 3

CRC

Hi Lo Hi Lo Hi Lo Hi Lo Hi Lo

01 10 00 00 00 03 06 00 1E 00 28 00 32 4F 5F

Slave Address Function

Start Address Number of Registers

CRC

High Low High Low

01 10 00 00 00 03 80 08

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 229 230

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