4.4 Analog and Digital Communication
The 25 Pin analog and digital I/O port on the rear panel of the instrument sends and receives analog
and digital signals to other devices. These signals are commonly used to activate gas calibrators or for
warning alarms.
4.4.1 Analog Outputs
The instrument is equipped with three analog outputs that can be set to provide either voltage (0 - 5,
0.25 - 5 or 0.5 - 5 V) or current (0 - 20, 2 - 20 or 4 - 20 mA) output. The analog outputs are tied to user
selected parameters (refer to Table 33).
For 0 - 10 V analog output operation, set the output mode to current and move the jumpers (JP3) on
the rear panel PCA to 0 - 10 V (refer to Figure 85). Ensure the current range is set to 0 - 20 mA to obtain
the 0 - 10 V range. When calibrating the (current) analog output with the jumper set to 0 - 10 V, the
4 mA calibration target is now a 2 V target and 20 mA calibration target is now a 10 V target.
4.4.1.1 Analog Outputs Voltage Calibration
Equipment Required
• Multimeter (set to volts)
• Male 25 pin connector with cable
Procedure
1. Open - Main Menu → Communications Menu → Analog Output Menu (refer to Section 3.4.26).
2. Select - Output Mode → Voltage.
3. Connect a multimeter (using an appropriate adaptor or probes on the multimeter) to the ground
(pin 24) and the relevant output pin (pin 10).
4. Edit - 0.5V Calibration - (until the multimeter reads 0.500 V ± 0.002) - Accept.
5. Edit - 5.0V Calibration - (until the multimeter reads 5.00 V ± 0.002) - Accept.
4.4.1.2 Analog Outputs Current Calibration
Equipment Required
• Multimeter (set to mA)
• Male 25 pin connector with cable
Procedure
1. Open - Main Menu → Communications Menu → Analog Output Menu (refer to Section 3.4.26).
2. Select - Output Mode → Current.
3. Connect a multimeter (using an appropriate adaptor or probes on the multimeter) to the ground
(pin 24) and the relevant output pin (pin 10).
4. Edit - 4 mA Calibration - (until the multimeter reads 4 mA ± 0.01) - Accept.
5. Edit - 20 mA Calibration - (until the multimeter reads 20 mA ± 0.01) - Accept.
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