FE-5650A Rubidium Frequency Standard (Frequency Electronics Inc.)

Pin 1 – +15 VDC
Pin 2 – GND
Pin 3 – LOCK signal (< 1VDC locked)
Pin 4 – +5 VDC
Pin 5 – GND
Pin 6 – Do Not Connect
Pin 7 – Do Not Connect
Pin 8 – RXD (Received data, TTL, 9600, 8, N, 1)
Pin 9 – TXD (Transmit data, TTL, 9600, 8, N, 1)

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