User`s manual

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FX3U Series Programmable Controllers

User’s Manual - MODBUS Serial Communication Edition

7 MODBUS Standard Commands

7.11 Diagnostics (Command Code: 0x08)

7.11.4 Change ASCII input delimiter (sub-command code: 0x03)

Changes the 2nd byte (LF(0AH)) of the end code in the ASCII mode to a specified data.

The specified data is stored in D8406/D8426.

1) Request message format (Master → Slave)

Note

(0x3A), "0"-"9" (0x30-0x39), "A"-"F" (0x41-0x46) and "a"-"f" (0x61-0x66) should not be used as they might

occur within the message and cause false end of frame detection.

2) Response message format (Slave → Master)

(When completed normally)

The slave returns the request message received from the master without change.

(When completed with an error)

*1. Exception and error codes are stored in special data registers and special auxiliary relays in the case

of error completion. Refer to Chapter 6 for storage location, confirmation methods, and other detailed

contents.

Start

END

Address field

2 characters

Function code

2 characters

Data

n x 2 characters

(n = 0 to 252)

Error check

2 characters

CR + LF

(0D

H) (0AH)

Change this into a specified data.

(3A

(L)

Data

Function code

Function

code

(08

Sub-function code

(0003

Input delimiter

setting

(00

H to FFH)

(00

(H)

Data

Function code

Function

code

(88

Exception

code*