ABB REO 517 Applications Manual page 437

Human-machine interface (HMI)
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The local HMI module consists of three LEDs (red, yellow, and green), an LCD with
four lines, each containing 16 characters, six buttons and an optical connector for PC
communication.
Optical connector
for local PC
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The PC is connected via a special cable, that has a built-in optical to electrical interface.
Thus, disturbance-free local serial communication with the personal computer is
achieved. Software tools are available from ABB for this communication. A PC greatly
simplifies the communication with the terminal. It also gives the user additional func-
tionality which is unavailable on the HMI because of insufficient space. The LEDs on
the HMI display this information:
LEDs
green yellow red
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Liquid Crystal Display
four rows
16 characters/row
Push buttons
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