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Chapter 2: Description
65-2640XL-04 M2A Transmitter Operator’s Manual
Just above each push button switch is a magnetic switch with the same function as the push button
switch below it. The magnetic switches are for use in non-intrusive calibration. They are actuated
by bringing the magnetic wand close enough to them to actuate them. Although the magnetic
switches have the same functions as the push button switches, it is not practical to use them for
operations other than calibration because it is not possible to actuate two magnetic switches at
once with only one magnetic wand. Since displaying the Information Screen only requires the use
of one switch, the wand may be used to show the Information Screen (see “Information Screen”
on page 24).
Status LEDs
The M2A includes five status LEDs that are located above the display (see Figure 4).
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Fail LED
The fail LED turns on when the M2A is experiencing a fail condition. A fail condition can
be caused by a detector failure or low detector signal.
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Alarm 1 LED
The alarm 1 LED is on when the M2A is experiencing an alarm 1 condition.
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Alarm 2 LED
The alarm 2 LED is on when the M2A is experiencing an alarm 2 condition.
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RX & TX LED’s
These LED’s indicate data being received (RX) and transmitted (TX) when the M2A’s
Modbus output is operating.
DOWN (NO)
• Cancels setting changes
• Changes the displayed setting
• Enters Gas Type Mode (press with UP/YES button)
• Enters Modbus Mode (press with ENTER button)
• Displays the Information Screen
ENTER
• Initiates operations
• Enters Configuration Mode (press with UP/YES button)
• Enters Modbus Mode (press with DOWN/NO button)
• Functions as an alarm reset switch
Table 2: M2A Control Button Functions
Switch
Function
