Alpha Technologies CFR 600, CFR 600XT, CFR 1000 - Manual (Page 14)

2. FEATURES
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Figure 3
CFR Front Panel with Standard Interface Device
Standard Interface Device
2.4 Information Management Options
Standard Interface Device
The Standard Interface Device provides you with vital UPS operating
parameters from front panel LED's (see section 4.2). The Standard Interface
also has a load indicator to help you determine precise loading on your UPS,
plus Manual Start and Alarm Off switches. To ensure optimum backup
performance, the Standard Interface comes with a self-test feature which
lights the “Service” LED whenever a problem is detected.