Monroe Electronics Electrostatic Fieldmeter - Static Monitor - model 177A - Manual (Page 23)

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Program LED:
Normally off. It is on when doing front panel setup.
Pulses on when the unit is a master. See section on master/slave operation in the User
Manual.Note: if USB cable A & B are connected to the same unit, oscillator is disabled.
FP Lock LED:
Normally off. On when the front panel is locked.
When the front panel is locked, only the [Setup] and arrow buttons work. You can unlock the unit, or
browse the program setup but cannot change it.
Master/Slave out & Slave in:
Purpose
These connections provide synchronization of the probe modulators on multiple 177A’s.
When probes are attached to common mountings from multiple 177A’s they can interact and
cause zero shifts and low frequency oscillations without synchronization of the modulators.
Setup
Master/Slave out and Slave in connectors are provided on each 177A. The Master/Slave out
either generates or passes through reference signal for synchronization. Multiple units can be
daisy chained as shown in Fig 14, on page 17.. The Slave in connector accepts the Reference
and forces the modulator to be synchronized with the other 177A’s. Standard USB cables with
Type A/B connectors are used for interconnects. These are supplied with the 177As.
Note. These connectors are NOT USB Ports
Remote LED
Normally off. Blinks when serial port is receiving.