Operating Instructions 6-7
HMI Control Panel
Use the HMI control panel to operate the unit. Refer to the Trailer Operator Manual TK 53232 and the SR-2/SR-3 Multi-Temp
Microprocessor Controller Diagnostic Manual TK 53080 for more information.
The HMI (Human/Machine Interface) Control Panel is connected to the microprocessor and is used to operate the unit and
display unit information. The HMI communicates with the controller via a controller area network (CAN) bus.
The HMI control panel has a display and eight touch sensitive keys.
The display is capable of showing both text and graphics.
The keys on the left and right sides of the display are dedicated or single function keys. These are termed “hard” keys.
The four keys under the display are termed “soft” keys. The functions of these keys change depending on the operation being
performed. If a soft key is active the current key function is shown in the display directly above the key.
HMI Control Panel
CAUTION: The unit can start at any time without warning. Press the O
FF key on the HMI control panel and
place the microprocessor On/Off switch in the Off position before inspecting or servicing any part of the unit.
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