65-2661RK-03-04 M2A Transmitter Operator’s Manual
8
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 38 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 38 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.
Figure 4: Control PCB Component Location
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 4). The UP/YES button is on the left, the DOWN/NO button is in the middle, and
the ENTER button is on the right.
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
