Laurel-electronics LTS6 - Manual Manual de usuario descargar pdf (Pagina 18)

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4. COMMUNICATIONS SETUP

Parameters selectable via Instrument Setup software, distributed on CD ROM:

Serial Protocol ...............................Custom ASCII, Modbus RTU, Modbus ASCII

Modbus ASCII Gap Timeout...........1 sec, 3 sec, 5 sec, 10 sec

Baud Rate.......................................300, 600, 1200, 2400, 4800, 9600, 19200

Parity .............................................No parity, odd parity, even parity

Device Address .............................0 to 247

5. SUPPORTED FUNCTION CODES

FC10: Write Multiple Registers (FC10 = 16 dec)

Writes internal registers containing input data for analog output and relays.

Dec Hex

Data Type Destination

107 006B Hi Word Hex Value Hi Word Applied to Item3

108 006C Lo Word Hex Value Lo Word Applied to Item3

FC05: Write Single Coil

Action command to transmitter

Output Address Output Value Action Command

00 01 FF 00 Transmitter Reset (No Response)

00 03 FF 00 Latched Alarm Reset

6. MESSAGE FORMATTING

MA = Device Address DD = Data (Hex) CL = CRC Lo Byte

FC = Function Code WW = Data (On/Off) CH = CRC Hi Byte

RA = Register Address SF = Sub-Function CR = Carriage Return

NR = Number of Registers EC = Error Code LF = Line Feed

NB = Number of bytes LRC = ASCII Checksum

Modbus RTU Format

Byte Number

FC Action

> 3.5

Char

1 2 3 4 5 6 7 8 9 10 11

Request

Response

NoTx

Request

Response

NoTx

DD*

CL CH

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24

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Laurel-electronics LTS6 - Manual Manual de usuario Pagina 18