These panels used GRS Syncrostep, pictured is the office unit. The B2 code transmitter (upper left) is a 270-code unit. It winds up when the system is at rest. When a code cycle begins, it releases and oscillates to generate the code. Click here to listen to two control codes being transmitted |
Equipment at field location for a 2-wire duplex system (right) |
Relation of oscillator contacts, stepping relays, and steps in a cycle. |
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Some other SyncroStep machines: |