RKI Instruments M2A Operator's Manual page 12

Ground Jumper
A two pin header with a jumper installed is located along the left side of the terminal PCB. This jumper has no
function in this version of the M2A and should be left alone.
Control PCB
The OLED display and control switches are located on the control PCB. It is installed on top of the terminal PCB
by lining up its three spacing standoffs with the banana jacks in the terminal PCB mounting standoffs and
pushing it onto the banana jacks. The jacks retain the control PCB.
OLED Display
The OLED display is located at the top of the control PCB. It indicates the current gas reading and displays
messages and parameters in the M2A's programs.
Control Buttons
The M2A includes three push button switches that allow you to enter the M2A's operating modes, navigate
through the modes, update settings, and save changes to the settings. The push button switches are located along
the bottom edge of the control PCB (see Figure 3). The UP/YES button is on the left, the DOWN/NO button is in
the middle, and the ENTER button is on the right.
Switch
UP (YES)
DOWN (NO)
ENTER
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 19).
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Table 2: M2A Control Button Functions
Function
• Saves settings
• Changes the displayed setting
• Enters the Calibration Program
• Enters Gas Type Mode (press with DOWN/NO button)
• Enters Configuration Mode (press with ENTER button)
• Cancels setting changes
• Changes the displayed setting
• Enters Gas Type Mode (press with UP/YES button)
• Displays the Information Screen
• Initiates operations
• Enters Configuration Mode (press with UP/YES button)
• Functions as an alarm reset switch
M2A Transmitter Operator's Manual