Delta RMC151 - Manual (Page 1184)

RMC70/150 and RMCTools User Manual
Figure 8: Open Collector Outputs to UI/O Inputs with Input Common Connected to Vcc.
Figure 9: Open Collector Outputs to UI/O inputs with input common connected to
ground. Typically not recommended due to the required external resistors and a
continuous current draw, and the fact that the logic becomes inverted. May be necessary
for mixing sourcing and sinking outputs.
For 24VDC power, the pull-up resistor should be a 4.7kΩ, ¼ watt resister. The output
must be capable of switching 2.6mA when closed. When the open collector output is
open, the DI/O input sees 11.8V @ 2.6mA.
For 12VDC power, the pull-up resistor should be a 1 kΩ, ¼ watt resister. The output must
be capable of switching 2.6mA when closed. When the open collector output is open, the
DI/O input sees 9.4V @ 2.6mA.
UI/O Quadrature Channel
Channels configured as Quadrature inputs should be wired as follows.
The A and B inputs interfaces only to 5V differential line driver (RS-422) signals. Higher
voltages will require a signal converter, available from 3rd party suppliers. Single-ended
(TTL) transducers are not supported due to low noise immunity. Always use twisted-pairs
1164 Delta Computer Systems, Inc.