Parameter

Value

Channels

2 axes × A, B, Z, differential

Receiver

Differential line receiver, 3.3 V supply

Differential input threshold

±100 mV minimum

Maximum input rate

6.5 MHz (design value)†, set by the motion controller

Termination

Not fitted. No termination resistor is present on the board or inside the receiver

Input voltage range

0 to 4.0 V absolute maximum at each input pin

Encoder supply

5 V on J5.3/4 (axis Y) and J5.21/22 (axis X), 0.25 A each, individually fused

Differential encoders. Typical 5 V RS-422 line drivers meet the input threshold when a 120 Ω termination resistor is fitted across each differential pair. None is fitted on the board, so fit the resistor externally — at the controller end of the cable — for cable runs of more than about a metre or at high count rates.

Single-ended encoders. Single-ended encoders are supported. Connect the signal to the inverting input (A−, B−, Z−) and leave the non-inverting input (A+, B+, Z+) unconnected. Note that this reverses the counting direction; invert it in software if required. Keep the single-ended high level within 0 to 4.0 V — 3.3 V logic or open-collector outputs are recommended.