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CABLE THRU
If more than one work station (display station or printer)
is to be connected in series on the customer twinaxial
cable, the Cable Thru feature must be installed on each
station or printer to provide connectors for the customer
system input cable to the next unit in the series. The
feature also provides 4 switches. Three of them provide
a unique address (encoded in binary) for the unit. The
4th switch (the Terminator switch), when set to 2,
Black
Wire
Wire
Yellow Wire
Address
'-_---1.... _ _ ""---
Switches
~
Cable Thru
Connector
•
2~
"-
Black dot marks the
terminal for black
stripped wires.
I
I+---=~-
"System Cable
Connector
Viewed from the Wiring Side
Black Striped Wire
Terminator Switch
Features
connects the system cable to the next work station in
the line. When the switch is set to 1, it connects the
system cable to ground through a resistor (termination).
The last work station in the series does not need the
Cable Thru feature. The basic printer has planar board
jumpers that connect terminating resistors into the
circuit. The basic printer
a/ways
has an address of 000
whether it is connected to a port or is the last device in
a Cable Thru series.
The Cable Thru feature is available only with twinaxial
cable. Up to seven work stations can be connected in a
series. Addresses range from 000 to 110. Address 111
is invalid and will cause the power on diagnostic to fail
with lights 5, 6, 7, and 8 on.
Note: Do not leave the external system cable
disconnected when servicing a printer that has the Cable
Thru feature. Other work stations are off line when the
cable is disconnected. An adapter (part 7362230 or
Amphenol part 82-5588) can be used to bypass a
disconnected work station.
If only 1 system cable is present, connect it at the lower
socket and set the Terminator switch to 1. If 2 cables
are present, connect the cable from the controller or
work station nearest to the controller to the lower
socket and set the terminator switch to 2. The other
cable (to the next work station) should be connected to
the upper socket.
,
Theory,
Features
Features
5256 MIM
5-1
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