76 M2A Transmitter Operator’s Manual
Appendix A: Control Button Quick Reference Guide
The M2A’s control buttons allow access to operational modes, resetting of alarms, and display of the Information
Screen. Table 21 shows which button combinations perform these functions and which parameters are available
for adjustment while in the operational modes. While in these modes, display prompts showing a “?” require you
to respond by pressing either the UP/YES (for yes) or DOWN/NO (for no) button. To change parameter settings,
use the UP/YES and DOWN/NO buttons to get the desired setting, then press and release the ENTER button to
accept the setting.
Table 21: Control Button Quick Reference Chart
Mode Entered or
Function Performed
Button
Combination
Adjustable or Viewable Parameters
Alarm Reset Press and Release
ENTER
n/a
Show Information Screen Press and Hold
DOWN/NO
• Input Voltage
• M2A Version/Revision Information
Calibration Mode Press and Hold UP/
YES for 5 seconds
• Fresh Air Adjust
• Span (or Zero for Oxygen) Adjust with Calibration
Gas
Configuration Mode Press and Hold UP/
YES & ENTER for 5
seconds
•Alarm Levels
• Increasing or Decreasing Alarms
• Normally Energized or Normally De-energized
Relays
• Latching or Self-resetting Alarms
• Alarm On Delay
• Alarm Off Delay (if self-resetting)
• Zero Suppression
• Noise Filter
• Calibration Time-out Period
Gas Type Mode Press and Hold UP/
YES and DOWN/
NO for 5 seconds
Gas Type
Modbus Mode Press and Hold
DOWN/NO and
ENTER for 5
seconds
• Enable or Disable Modbus
•Slave ID
•Baud Rate
•Parity
• Response Delay
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