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MODBUS physical interface
This product implements the MODBUS RTU protocol standard over an RS485 interface. The RS485
interface is accessible via the RJ45 connector on the bottom of the power supply unit. Pin connections
follow the official guidelines of the Modbus Organisation. Pin connections as follows, colour codes used for
standard T-568A and T-568B varieties of network cable are included for reference.
RJ45 PINOUT
Pin Function
T-568A
T-568B
1
Reserved for future use
Green/white
Orange/white
2
Reserved for future use
Green
Orange
3
Reserved for future use
Orange/white
Green/white
4
MODBUS B
Blue
Blue
5
MODBUS A
Blue/white
Blue/white
6
Reserved for future use
Orange
Green
7
5V @ 100mA max
Brown/white
Brown/white
8
0V ground
Brown
Brown
The RJ45 interface of your ECOMATIC COMM series chlorinator is designed to maintain ingress protection
performance when used with the included sealing boot over an un-booted RJ45 plug.
MODBUS register specification
The product consists of holding registers which can be read (using MODBUS function 3) as below:
Register Name
Description
1
Start delay
How long till start-up delay is complete (seconds)
2
Direction
The direction the cell is running (0=off, 1=forward, 2=reverse)
3
Run Current
How much current is running through cell (mA)
4
V1
Voltage on one side of cell cable at PCBA (mV)
5
V2
Voltage on other side of cell cable at PCBA (mV)
6
Bridge Temp
Temperature in high current area of PCBA (°C)
7
Micro Temp
Temperature in logic control area of PCBA (°C)
8
Pot Position
Position of output control knob (0 - 1024)
9
DIPS
PCBA DIPs setting (b0 = DIP1; b1 = DIP2; b2 = DIP3; b3 = DIP4)
10
ORP
Whether ORP input is triggered (0=false; 1=true)
ENGLISH
