GUILCOR AR006708, Инструкция по эксплуатации

Страница: 17 / 29

18
value shown at first LCD line: temperature / CO
2
- by device type
value shown at second LCD line: relative humidity / dew point temp. – by device type
temperature unit: °C
computed value preset: dew point temperature
obnova nastavení regulátoru od výrobce
6. Description of communication protocols
Detailed description of each communication protocols including examples of communication is
available into document “ Description of communication protocols”, which is available to download
at www.
guilcor
.com , see detailed description of appropriate device type. After switching ON the
power of the device it can last up to 3 s before the device starts to communicate and measure !!!
6.1. Modbus RTU
Control units communicate on master-slave principle in half-duplex operation. Only master can
send request and only addressed device responds. During sending of request no other slave station
should respond. During communication, data transfer proceeds in binary format. Each Byte is sent as
eight bit data word in format: 1 start bit, data word 8 bit (LSB first), 2 stop bits
1 , without parity.
Device supports communication speed from 110Bd to 115200Bd.
Sent request and response have syntax: ADDRESS OF DEVICE – FUNCTION – Modbus CRC
6.1.1. Supported functions
03 (0x03) : Reading of 16-bit registers (Read Holding Registers)
04 (0x04) : Reading of 16-bit input gates (Read Input Registers)
06 (0x06): Setting of one 16-bit register (Write Register)
16 (0x10) : Setting of more 16-bit registers (Write Multiple Registers)
6.1.2. Jumper
Jumper (placed nearby keys) is accessible after demounting of four screws in the corners of the
box and removing the lid. If communication protocol Modbus is selected the function of jumper is
as follows:

Jumper opened – device memory is protected from writing, from device side it is only enabled
to read measured value, writing to memory is disabled (no change of settings is enabled)

Jumper closed – writing to regulator memory is enabled
1
Device sends two stop bits, for receive one stop bit is enough.