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Single Ended Step & Direction to a Compax3

Single-Ended Input for Compax3

If the customer cannot provide a differential RS422 signal because he has only a single-ended open-collector signal then he has to use an external 332 ohm open-collector resistor for the RS422 input, the inverse RS422 input needs a voltage-divider circuit with 821ohm / 600ohm and a 100nF capacitor.

Duplicate the circuit below for Step and Direction.


Single-Ended Step & Direction Diagram


The RS422 inputs have bus termination, and we use that capacitor to have a constant potential on the Step- and Direction- signals.

Step

Component Value PIN PIN
Resistor 332 Ohm X11/5 X11/7
Resistor 821 Ohm X11/5 X11/6
Resistor 600 Ohm X11/6 X11/15
Capacitor 100nF X11/6 X11/15


Direction

Component Value PIN PIN
Resistor 332 Ohm X11/5 X11/8
Resistor 821 Ohm X11/5 X11/12
Resistor 600 Ohm X11/6 X11/15
Capacitor 100nF X11/6 X11/15