65-2649RK-CH4-4 M2A Transmitter Operator’s Manual
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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 14 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 14: 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
