Applies To:
  • CitectSCADA x.x

Summary:
I am having trouble setting up communications with the GE SR 750 Data Logger. 

Solution:
The SR750 uses COMX and the MODBUS protocol. The Data Loggers' address and communications parameters can be found by interrogating the unit using the front panel controls , however this is difficult to drive and an easier method is to use an interface program available from www.ge.com/edc/pm/catalog/index The RS232 cable must be straight through no crossover.

The citect.ini file must include the line [MODBUS]InitType = 3 (Mandatory for communications).

When setting up your tags the tag type must be INT within the range 30001 to 49999 and the tag reference in the manual (SR750/760 Feeder management relay Instruction manual P/N 1601-0044-A9) must be converted to decimal and add 1. 

Input Registers 30001 to 39999 INT / LONG / STRING / REAL
Output Registers 40001 to 49999 INT / LONG / STRING / REAL

EXAMPLE:

Variable Tag Name Last_Trip_Phase_A_current
Data Type INT
Address 30742             (converted to decimal + 1)
Comment Read only register address 02E5 (From the manual)

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