Interfaces; Thermocouple Inputs; Analog Inputs - Focal 923 User Manual

Model 923 Data Logger – User Manual

3.5 Interfaces

3.5.1 Thermocouple Inputs

The 923-EDL allows two (2) K-type thermocouples to be connected to 3 pin connectors J6 and J15. The card
performs cold-junction compensation and the data output of each thermocouple is saved as an IEEE-754 32-bit
floating point value in Modbus registers and also saved in the on-board flash memory.

3.5.2 Analog Inputs

The 923-EDL provides access to two (2) single-ended analog inputs via the 12-pin connector J4. The default
input voltage range is dependent on a factory configurable resistor divider for each channel. The default
configuration yields a maximum input on channel 1 of 14.76V. The maximum input on channel 2 is 4.95V.
Applying higher voltages to the analog channels could damage the analog input circuits.
The resolution of the ADC is 10-bit and the data is sampled at 200 Hz. Each ADC channel is calibrated at the
factory using a scale factor (saved as an IEEE-754 32-bit floating point). The data output of each ADC and the
scaler is stored in Modbus registers and in the on-board flash memory.
Focal Technologies Corporation Page 3-5
A Moog Inc. Company Document No: 923-0603-01, Rev. 2