The discussion revolves around connecting a quadrature encoder, which has differential signal outputs (A-, A+, B-, B+), to a single-ended encoder channel on a driver. Participants explore the feasibility of direct connections and the implications of signal types.
Participants express varying opinions on the correct method for connecting the encoder to the driver, with no consensus reached on the best approach. Some suggest direct connections while others raise concerns about compatibility and signal integrity.
There are unresolved questions regarding the specifics of signal compatibility between differential and single-ended systems, as well as the implications of connecting directly to the motion controller without going through the driver.
jxlee said:I have one quadrature encoder with A- A+ and B- B+ Signal, but my driver is a single-ended encoder channel?
Can i just connect either the A+ and B+ or A_ and B- signal to the single-ended encoder channel?
Please advise.
Thanks
Standard polarity signals consist of a “positive” level, pulse or edge in RS-422 input mode. (This
means the + input has a higher, more positive, voltage than the – input.) In single-ended logic-level
input mode, standard polarity consists of a “negative” level, pulse or edge. (This means the input is
at logic zero, about 0.7 volts or less.)
This definition of polarity is by convention. TTL signals have been historically “active low.” Many
sensors and opto-couplers are “active low.”