RM-26999 Pinouts

Use the pinouts to connect to terminals on the RM-26999.

Current Transducer Calibration Port (Cal Input) Pinout

This 9-pin DSUB port allows you to calibrate current transducers with calibration windings that are connected to the RM-26999.

The Current Transducer Calibration Port routes to each of the four current transducer ports.

Figure 13. Current Transducer Calibration Port


Table 13. Current Transducer Calibration Port Signal Descriptions
Pin Description
1 Transducer 3, calibration winding +
2 Transducer 2, calibration winding +
3 Transducer 1, calibration winding +
4 Transducer 0, calibration winding +
5 Ground reference
6 Transducer 3, calibration winding -
7 Transducer 2, calibration winding -
8 Transducer 1, calibration winding -
9 Transducer 0, calibration winding -

RM-26999 Current Transducer Port Pinout

The RM-26999 does not directly measure current. Use a current transducer to measure current. The 9-pin DSUB Current Transducer Ports on the device are optimized for flux-gate transducers by providing all the necessary power, communication, and signal lines.

Table 14. Current Transducer Ports
Port Signal NI-DAQmx Channel
Current 0 AI4 MIODevice/ai4
Current 1 AI5 MIODevice/ai5
Current 2 AI6 MIODevice/ai6
Current 3 AI7 MIODevice/ai7
Figure 14. Current Transducer Port Pinout


Table 15. Current Transducer Port Signal Descriptions
Pin Description
1 AI- channel input, ±10 V signal
2 Calibration winding -
3 Transducer status ground
4 Transducer supply ground return, ±2.25 A maximum
5 -15 V transducer supply output, ±5%, no load, 2.25 A maximum
6 AI+ channel input, ±10 V signal
7 Calibration winding +
8 Transducer status, 5 V, 10 mA maximum
9 +15 V transducer supply output, ±5%, no load, 2.25 A maximum
Note The RM-26999 allows you to calibrate your current transducers, if necessary for your system. Consult your transducer documentation to verify that your transducer supports calibration through windings.