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16 | OMNI POWER AND CONTROL INTERFACE SYSTEMS
Med Control connector
Med Associates Connection panels are connected to devices in the chamber by the Med Operate ports (usually)
using SG-224A cables. Instead of Med Inputs or Med Outputs as seen on earlier generation SmartCtrl and
Superport Connection panels, the Omni Connection Panels introduce Med Operate I/Os (Input/Outputs). The
Omni Control Interface will determine the orientation of the device and send or receive signal as appropriate in
a "plug and play" fashion. Inputs and Outputs register differently on the IC-124 Interface Card and Med-PC
requires a port be designated as part of the protocol before it can be used (see I/O Configuration p.18).
Med Operate connectors adhere to a consistent pin-out. Med-PC sends active-low operate signals. Meaning that
the signal is active when the voltage drops to ground on the Operate line (see Figure 2.6 - The pinout of Common
Med Control Connectors).
The connected device will usually operate until the Operate signal stops, meaning power returns to the Operate
pin (2). This reduces latency in operation, and helps confirm connection integrity, but care must be taken if
damage is done to the Operate pin line as a short between this line and the Ground pin (1) will trigger the device.
Med Inputs are capable of handling signals less than 3 amps at 28 V DC, with the intent of short burst signals.
Constant signals should moderate amperage to reduce strain on the circuits. If you have questions about your
application, contact Med Associates support. See Chapter 8 Safety, Fail-safes, and Repair: Contact Information
p. 28. We happily share our best advice.
FIGURE 2.6 - THE PINOUT OF COMMON MED CONTROL CONNECTORS
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