Delta RMC151 - Manual (Page 1185)

10 Wiring and Installation
for the A and B signals. Do NOT connect the transducer Ground or Cmn to the cable
shield, Case, or earth ground. The user must supply power for the transducer or encoder.
Termination
Termination is software selectable and should always be used. If quadrature inputs are
daisy-chained, apply termination only to the last input.
After setting up the UI/O input as quadrature, and assigning the input to an axis, the
Input Termination parameter will be available on the All tab in the Axis Parameters
Pane, in the Feedback section. Choose ±A and ± B to apply termination.
UI/O SSI Channels
The SSI Clock and Data pins interface only to 5V differential line driver (RS-422) signals.
Always use twisted-pairs for the Clock and Data signals. Do NOT connect the transducer
Ground or Cmn to the cable shield, Case, or earth ground. The user must supply power
for transducers or encoders.
Maximum SSI Cable Length
For SSI inputs on the UI/O module, wire delay compensation is available. If your cable
length exceeds the length for your clock rate given in the table below, you should use the
SSI Wire Delay parameter to account for the time delay of the SSI signal:
SSI Clock Rate Maximum Cable Length*
250 kHz 770 ft (235 m)
500 kHz 325 ft (99 m)
971 kHz 110 ft (34 m)
* The cable lengths are approximate, and may be affected by the type of wire and
transducer.
SSI Inputs
Channels configured as SSI inputs and interfacing to transducers or encoders should be
wired as follows.
SSI, UI/O to UI/O
SSI channels configured for communicating between RMCs should be wired as follows.
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