Unication E5 Spécifications télécharger pdf (Page 84)

4 Modbus Communications Procedure

4 - 4

E5C-T Digital Controllers Programmable Type Communications Manual (H186)

z Normal Response Frame

z Error Response Frame

4-1-2 Response Frame

Slave address

The number specified in the command frame is entered as-is. This is the unit

number of the Unit returning the response.

Function code

This is the received function code with the hexadecimal value of H'80 added to

indicate that the response is an error response.

Example: Received function code = H'03

Function code in response frame when an error occurred = H'83

Error code This code indicates the kind of error that occurred.

CRC-16

Cyclic Redundancy Check

This check code is calculated with the data from the slave address to the end

of the data.

The check code is 2-byte hexadecimal.

CRC-16

Data

CRC-16 calculation range

2 bytes

Slave

address

Function

code

CRC-16

111

CRC-16 calculation range

2 bytes

Slave

address

Function

code

Error

code

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 185 186

Pas de commentaire

Unication E5 Spécifications Page 84