Nortec Modbus - Manual (Page 36)

MES2 and RH2 Models
The default Modbus address for a humidifier is 1.
To view or change the unit number:
1 Establish Modbus communications and map desired points as indicated in the following
table.
2 Read the current Modbus address from variable 40201.
3 Change this address by writing the desired value to 40201. Values of 1 – 255 are
acceptable.
By default the MES2 and RH2 are configured operate on a control signal supplied through the
unit terminal strip. This can be changed to allow the humidifier to function entirely through its
Modbus interface. This is configured by removed Jumper 26 from the humidifier circuit board.
Jumper Position Function
J26 Removed Terminal strip control
J26 Installed Modbus control
MES2 and RH2 Electrode Steam OEM Humidifiers
The MES2 and RH2 both use the following parameters for communication:
Signaling Type EIA-485
Transmission Mode RTU
Baud Rate 9600 (can be changed to 4800 bps or 19200 bps)
Data Bits 8
Stop Bits 1
Parity Even
Address / Unit Number 1*
*Default, may vary for multi-unit orders.
Modbus Installation | 33