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65-2670-XX-04 M2A Transmitter Operator’s Manual
Termination Jumper
A two pin header with a termination jumper installed is located below the Modbus terminal strip.
Leave this jumper installed unless directed to remove it for a Modbus installation. See “Chapter 8: RS-
485 Modbus Output” on page 44 for a description of using the M2A in a Modbus system.
Ground Jumper
A two pin header with a jumper installed is located along the left side of the terminal PCB. Leave this
jumper installed unless directed to remove it for a Modbus installation. See “Chapter 8: RS-485
Modbus Output” on page 44 for a description of using the M2A in a Modbus system.
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 5). The UP/YES button is
on the left, the DOWN/NO button is in the middle, and the ENTER button is on the right.
Figure 5: Control PCB Component Location
ENTER
DOW N/NO
UP/YES
Push Button
Control Switches
Magnetic Switches
ENTER
UP/YES
DOW N/NO
Alarm 1 LED
Alarm 2 LED
Fail LED
RX LED
TX LED
M2A TRANSMITTER
RKI INSTRUMENTS
OLED Display
