Carel GDSBI20C00 - Modbus Network Configuration

20
ENG
Gas Leakage Detector +0300047IE rel 1.1 - 26.04.2023
Operation
3.8 Modbus® network
For the Modbus RS485 network, use a shielded 3-wire cable. Recommended: Belden 3106A (or equivalent).
The Modbus communication parameters can only be set using the Rileva TE app or the rotary switch on the device’s electronic
board.
Make sure that the network communication parameters are congured in the same way, including on the supervisor.
To ensure optimal operation of the serial network, observe the following guidelines:
• make sure that the devices are congured with a single bus layout; connecting several buses in parallel, or branching several
devices from the main bus may introduce incorrect combinations of signal impedance, reections and/or distortions.
• Avoid using excessively long connections when connecting devices to the serial bus. The device - bus connection must not
exceed a maximum length of 1 metre.
• Make sure that the polarity of the A (+, Tx) / B (-, Rx) signal is maintained across the serial network.
• Earth the cable shield only on the main unit side.
• Connect the cable shield to terminal SH on the gas detector.
• Make sure that the shield is intact across the serial network.
• Do not use the shield connection as a signal reference. Use a cable that provides a dedicated wire for the signal reference.
Connect the signal reference to terminal GND on the gas detector.
The CAREL GLD series gas detectors feature a Modbus RTU digital interface. All of the status messages and most of the param-
eters accessible and/or congurable via the Bluetooth® interface are also accessible and/or congurable via a Carel MODBUS
controller.
Parameters for RS485 communication selectable via app or rotary switch
Parameter Possible values Default value
Address
0 to 247 via app
0 to 100 via device
0
Baud rate 9600 or 19200 19200
Stop bits 1 or 2 2
Parity None, Even or Odd. None
IMPORTANT: Each device connected to the same RS485 bus must have its own address, otherwise there will be conicts
in transmission/reception that prevent serial communication.
IMPORTANT: The write registers are password-protected. By entering the password in the appropriate register, authorisa-
tion to write the variables will be provided for 15 minutes. There is a specic variable that indicates whether or not the device is
currently locked.
The password to unlock the device is 2222.
IMPORTANT: When using a CAREL BOSS family supervisor, it is recommended to enter the device unlock password at least
once, so that all the devices can be displayed correctly. This is necessary when asterisks (***) are displayed in the parameters
section instead of the value