TEMPTRAC INTERFACE GUIDE, GATEWAY SETUP AND POINTS LIST
Page 3 of 30 PV7069-T 03/17
Part number 129209
TempTrac Heater MODBUS fixed settings:
Most of theMODBUS RTU and Port settings are not adjustable
Baud Rate: 9600bps (Not adjustable)
Data Length: 8 bit (Not adjustable)
Parity: None (Not adjustable)
Stop Bits: 1 (Not adjustable)
Start/Stop: Silent interval of 3 characters minimum
Minimum Time Between Retry: 500 msec.
Maximum read command is 5 words
Steps to change the TempTrac MODBUS address:
Editing parameters should be done without any device trying to communicate through the MODBUS port.
To avoid interference from a gateway or BAS, you should unplug the MODBUS adapter port on the back
of the TempTrac atthe white header, while making changes tothe TempTrac parameters.
The first step tointerfacing with a TempTrac or group of TempTracs will be the assignment of theaddress
number for each boiler. The default for TempTrac is Address #1. You can assign any number in the range
of 1-247. This is the limitations of the MODBUS RTU standard.
The MODBUS address is the Adr parameter, and it is in the Pr2 menu.
Enter the Programming mode by pressing the SET and DOWN key for more than 3 seconds. (Lead with
the SET key.)
Pressing the DOWN key, parameters will display in top, and value in bottom.
Select Pr2 / PAS (parameter / value), and press the SET key.
The lower display will show the value 0 --with a flashing zero.
Use UP or DOWN keys to inputthe security code in the flashing digit; confirm
each digit by pressing SET. The security code is 321.
After hitting SET on the last digit, you will be in the Pr2 menu.
Once you have entered the Pr2 menu press the DOWN key to move through
the parameters until the Adr parameter appears on the top display.
Now press the SET key once and the value number will begin to blink. Use
the arrow key to set the address and then hit the SET key.
After hitting the SET, it will automatically go to the next parameter. Let it time
out, or cycle power to the TempTrac.
Each TempTrac on a RS-485 network must have a unique MODBUS
address.
The TempTrac MODBUS adapter port:
The MODBUS adapter is an orange dongle with 2green screw terminals attached to an 8 inch cable that
plugs intothe back of the TempTrac at a white header. This can be an option installed on heater, or it may
be a separate line item part.When the option is available, it is MBUSC option code. As a standalone part,
it is PN: 11807.
