GE IC698CHS109 RX7i 9 VME Slot Rack, Panel Mount
For information about bus selection and installation, you should refer to the GeniusI/O System User’s Manual.
Connect the bus cable to the terminal assembly on the front of the Bus Controller. The
tie-down screws can be removed to accommodate ring-type connectors. Terminal desig nations,
illustrated below, are also shown on the module faceplate.
The maximum exposed length of bare wires should be two inches. For added protection,
each shield drain wire should be insulated with spaghetti tubing to prevent the Shield In
and Shield Out wires from touching each other or the signal wires.
Replacing an Older Bus Controller
If this hardware (GIOC1) is being used to replace older hardware (GIOA1 or GIOB1: see
markscreen on the edge of the board), the GENIUS bus connections to the Bus Control ler must be rewired. Refer to the
wiring label inside the module cover for detals con cerning the proper wiring of the connector. Note that GIOC1 hardware was also used
with Genius Bus Controller versions IC697BEM731B and C.
Shield In and Shield Out Connections in an Existing Installation
The actual positions of the Bus Controller’s Shield In and Shield Out terminals are cor rectly shown above. On the faceplates of older Bus Controllers and in earlier revisions of
the documentation, these terminals are shown reversed. Regardless of the markings on the
faceplate, all Series 90–70 Bus Controllers have their Shield In and Shield Out terminals in the
positions shown above.
Because of this inconsistency, Bus Controllers in an existing installation may have their
Shield In and Shield Out terminals incorrectly connected (that is, not as illustrated
above). For most applications, this should not be a problem, and rewiring is not neces sary. If noise immunity is a particular concern, however, rewiring of the Shield In and
Shield Out terminals on these older Bus Controllers is recommended.

Each Genius communications bus must be terminated at both ends by its characteristic
impedance, as explained in the Genius I/O System User’s Manual.
If the Bus Controller is located at the end of a bus, install the appropriate resistor across
its Serial 1 and Serial 2 terminals.
Wiring for Bus Continuity
For a redundancy system, where another CPU on the bus will be capable of acting as a
controller, jumpers should be installed on the Bus Controller’s terminal assembly as
shown at right. This will allow possible removal of the terminal assembly in the future
without breaking the continuity of the bus.
For bus continuity, jumper the Serial 1 terminals together and jumper the Serial 2 termi
nals together (even if the Bus Controller is at the end of the bus). Alternatively, use only
one terminal of each pair, and wire both cable ends to the selected terminals.