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7.16 RD494 RESISTIVE LADDER PERIPHERAL UNIVERSAL INTERFACE
MODULE
7.16.1
General
The RD494 Module is compatible with a broad range of VCRs, Quads, Monitors, Frame
Store Units, Video Printers and other devices. The module has the capability to support
1 peripheral device by means of its RS-232 port, or up to 8 peripheral devices
simultaneously via the eight (8) resistor ladder control ports.
The module also features 8 level sensing alarm inputs, the input threshold being DIP-
switch selectable.
7.16.2
Operation
The RD494 can operate in 2 modes. In resistive mode, it will simulate resistive values
normally presented to a peripheral device from a "wire-line" type remote control. In the
RS-232 mode, connection to peripheral equipment is simply achieved by connection to
the RS-232 port (non-standard RS-232 pin outs).
When configured as level sensing, the alarm inputs detect whether a voltage is above or
below a pre-set threshold of 3, 6, 9, or 12V. The alarm logic may also be inverted. A self-
biasing option is also available for contact closure alarms.
The RD494 is pre-programmed to suit a range of VCR and Multiplexer types, which can
be selected by SW2.
Rev. C
WARNING:
Users should consult the manufacturers'
manual with regards to the maximum cable lengths for
remote control devices when using the RD494 module.
This information is for the RD494 V2.04 firmware revision.
If you require information for an earlier RD494 version,
please contact your MAXPRO-Net dealer or Honeywell.
7.16-1
HMXMU001018
10/06
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