Laurel-electronics LTE SERIES TRANSMITTERS ANALOG INPUT Instrukcja Użytkownika Pobierz pdf (Strona 30)

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Modbus ASCII Format

Byte Number

FC Action

1 2 3 4 5 6 7 8 9 10 11 12 13

Request

Response

DD*

LRC

Request

Response

DD*

LRC

Request

Response

LRC

Request

Response

LRC

Request

Response

LRC

DD*

LRC

CR LF

Exception

Response

: MA

+80

EC LRC

CR LF

DD* = (DD DD) times NR (Number of Registers)

7.0 MESSAGE EXAMPLES

All examples are for Transmitter Address = 01 and No Parity.

Ser_4 ->

Addr ->

Action

Modbus RTU

010

001

Modbus ASCII

020

001

Restart Com-

munications

Request

Response*

010800010000B1CB

:010800010000F6crlf

Meter Reset Request

Response

01050001FF00DDFA

None

:01050001FF00FAcrlf

None

Digital Reading

** ***

Request

Response

01040003000281CB

010404000009D67C4A

:010400030002F6crlf

:010404000009D618crlf

Write Setpoint

1 = +37.00***

Request

Response

0110000100020400000E743624

01030400000E74FE74

:0110000100020400000E7466crlf

:011000010002ECcrlf

Read Setpoint

1 = +37.00***

Request

Response

01030001000295CB

01030400000E74FE74

:010300010002F9crlf

:01030400000E7476crlf

* Suggested as first message after power-up. If transmitter is in Listen-Only mode, no response

is returned. ** Example while reading +25.18 *** Decimal point is ignored.

8.0 INTERNAL REGISTERS: Please refer to the full Modbus Protocol Communications Manual,

which is downloadable from our website.

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