Toho-electronics TTX-700 Manual de usuario descargar pdf (Pagina 34)

7. Specifications

7.1 Communications standard category: Compliant with EIA standard RS-485

7.2 Communications specifications

7.2.1 Communications system

Network: ...................................For RS-485, multi-drop system (up to 1 pair, 31 stations)

Direction of information:..........Half duplex

Synchronization system:...........Asynchronous

Transmission code: ...................ASCII, 7/8 bit code, except for BBC data

(highest-level bit = 0 in 8-bit code)

7.2.2 Interface system

Signal line:................................2 lines for transmission and reception

Communications speed:............One speed is selected from 1,200, 4,800, 9,600, and 19,200 bps

and this product is set to it.

Communications distance:........500m maximum

Provided that it varies somewhat depending on the cable and other

ambient conditions.

7.2.3 TOHO communications characters

Start bit length: .........................Fixed at 1 bit

Stop bit length:..........................Either 1 or 2 bit is selected and this product is set to it.

Data length:...............................Either 7 or 8 bit is selected and this product is set to it.

Parity: .......................................No. Either odd or even is selected and this product is set to it.

BCC check:...............................Yes or no is selected and this product is set to it.

Communications address:.........1-99

7.2.4 MODBUS communications (RTU) characters

Start bit length: .........................Fixed at 1 bit

Stop bit length:..........................Either 1 or 2 bit is selected and this product is set to it. (If

parity-equipped, fixed at 1 bit.)

Data length:...............................Fixed at 8 bit.

Parity: .......................................No. Either odd or even is selected and this product is set to it.

CRC-16 check: .........................Fixed at yes.

Communications address:.........1-247

7.2.5 MODBUS communications (ASCII) characters

Start bit length: .........................Fixed at 1 bit

Stop bit length:..........................Either 1 or 2 bit is selected and this product is set to it. (If

parity-equipped, fixed at 1 bit.)

Data length:...............................Fixed at 7 bit.

Parity: .......................................No. Either odd or even is selected and this product is set to it.

LRC check: ...............................Fixed at yes.

Communications address:.........1-247

7.2.6 MODBUS communications (ASCII/RTU) function codes

03H (reading the contents of the holding register)

10H (writing the contents of two or more holding registers)

３４

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 40

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Toho-electronics TTX-700 Manual de usuario Pagina 34

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