Nortec Modbus - Manual (Page 25)

To adjust this setting:
1 Press the Menu key to access the menu.
2 When prompted for a password, enter 0335 using the arrow keys. Confirm the password
with set.
3 Select the Control Settings menu and press the Set key. The following settings can be
adjusted:
Source:
Analog: Use hardwired control signal
Digital: Write control signal through modbus interface
REG Mode:
Demand: Use a demand control signal
RHp: Use a sensor value and proportional
RHpi: Use a sensor value and proportional-integral control band
MOD Mode:
Single CH: Use a signal channel control signal
Dual CH: Use a dual channel control signal
CNT Type: Setting not relevant when writing control signal through modbus.
Note: Refer to the GSTC Total Controller Flow Chart section of the GS Series Installation and
Operation Manual for more information on the above settings.
4 Press Esc repeatedly to return to the home screen when complete.
This procedure is summarized below:
Menu > 0335 > Control Settings >
Source: Analog or Digital
Reg Mode: Demand, RHp, or RHpi
Mod Mode: Single CH or Dual CH
CNT Type: As required
Modbus Parameters
The GSTC uses the following parameters for communication:
Signaling Type EIA-485
Transmission Mode RTU
Baud Rate 9600
Data Bits 8
Stop Bits 1
Parity None
Address / Unit Number 1*
*Default, may vary for multi-unit orders.
It is important to note that the signaling type, transmission mode, baud rate, data bits and stop
bits cannot be modified. Parity and unit address can be modified as required.
22 |Modbus Installation