How to generate an external 1000Hz square wave trigger signal to Fiber optic gyroscope--FOG (for example, G-F60)?

Our fiber optic gyroscope supports RS422 bidirectional serial communication protocol. The transmitter (Tx+, Tx -) is used to send gyroscope measurement data to the client-side, and the receiver (Rx+, Rx -) is used to receive external trigger signals. You need to design a hardware circuit board as shown in the following design diagram, or use existing circuit design to utilize the following functions.

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