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Hand-held Monitor User’s Guide – June 1994
GFK-0121E
Making the Bus Connections
The HHM connector has two sets of terminals; one for incoming cable and the other for
outgoing cable.
Connect the Serial 1, Serial 2, and Shield In terminal of either connector to the previous
device. Connect the Serial 1, Serial 2, and Shield Out terminal of the other connector to
the next device.
When making bus connections, 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.
The following illustration shows connections for incoming and outgoing serial bus cable.
As with other devices, the HHM connector may be at either end of its bus. If it is, there
will only be one bus cable attached.
X1
X1 X2
X2 SA SB
SA SB
X1 Serial 1
X2 Serial 2
SA Shield In
SB Shield Out
Bus In
Bus Out
46366
As with other devices, if the HHM Connector is at either end of its bus, install an
appropriate terminating resistor across the Serial 1 and Serial 2 terminals. The Genius I/O
System and Communications User’s Manual lists appropriate terminating resistors for each
recommended bus cable type.