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Chapter 5
Counter Output
The Servo Tyer comes standard with a relay, which toggles every time a valid package
is tied. This relay is normally used to drive a customer's external counter, but it can be
adapted to serve other functions with external customer logic. This relay does not toggle
if the tie cycle is aborted or if a heel is detected in the tie. These contacts can be
configured to be normally open or normally closed using Dip Switch 2 of SW1, on the Aux
board (pg. 87). If the relay is configured to be normally open, the contacts will close for
about 1/4 second when a valid tie cycle is completed.
PROM Replacement
The computer program for the Servo Tyer resides in two (2) Programmable Read Only
Memory chips (PROMs), U12 and U15 on the CPU board. Each PROM contains half of
the program. To upgrade the Servo Tyer to the latest program, the PROMs must be
replaced with a new version. This is a simple process, which can be accomplished in 10
to 15 minutes. Before replacing the PROMs, note the positions of the Dip Switches on the
lower left of the Auxiliary Board to ensure that they are not accidentally changed by
handling the boards.
Remove power from the Servo Tyer and disconnect the Auxiliary board's 5V/12V
connector from the power supply. Carefully pull the board set from the Field Termination
Board. There should be enough slack in the motor cable to allow the board set to rotate
out to the right without disconnecting the leads. The CPU board should now be facing out
with the single character LED display on the bottom right of the board. The PROM's are
the two (2) 32 pin chips in sockets on the right side of the CPU board. The program
version is labeled on the top of each PROM. In general, you should use the PROM with
the higher program version. For example, version 2.07 is newer than version 2.06. Each
PROM will also be labeled either HIGH or LOW. Make sure that each is inserted in the
socket with the same label.
To remove a PROM from its socket, use a very small screwdriver to pry the PROM up
from its socket. Never pull the PROM out by hand because one side will suddenly release
before the other side and some of the pins will be bent.
CAUTION: The PROM's are sensitive to static electricity and care
should be taken not to expose them to static.
CAUTION: The pins on the PROM's are delicate and will break if
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