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CHAPTER 2
SET UP KEYBOARD/REMOTE
MAINTENANCE
1. Keyboard Terminal
1 .Ol
PERCEPTION,
and
PERCEPTION,,
systems
are designed
to interface
with a standard
asynchronous
keyboard/printer
data terminal
(a
Texas instruments
Model 743or745,
or equivalent)
or a personal
computer
configured
as a dumb
terminal.
The terminal
is connected
to the system
via a female-type
RS-232C
connector
(labeled
TTY), which is located on the connector
panel on
the lower rear of the basic cabinet.
The TTY port
can operate
at a speed of either 300 or 1200 bps,
which is designated
by a switch on the front of the
LCCU PCB. The selected
bps setting must match
the setting on the connected
modem or TTY. TTY
and
modem
port
pin
assignments
for
PERCEPTlONe
systems
are shown in Table 2-1,
while assignments
for PERCEPTlONe,
systems
are shown
in Table 2-2.
2. Remote Administration
2.01
PERCEPTlONe
and PERCEPTIONex
SYS-
terns can be programmed
and tested
from a re-
mote location
via a locally-provided
300 or 1200
bps modem.
Utility Programs
can be called up via
a telephone
line and then the desired data change
or test can be performed.
On the PERCEPTION,,
the modem connects
to the TTY RS-232C
connec-
tor on the rear of the basic cabinet
via a Null
Modem
cable (see Table 2-1 for PERCEPTlONe
pin assignments).
On the PERCEPTIONex,
the
modem connects
directly to the modem connector
on the rear of the basic cabinet (see Table 2-2 for
PERCEPTIONex
pin assignments).
PROGRAMMINGPROCEDURES
SECTION 200-255-302
FEBRUARY1992
3. Data Format
3.01
The PERCEPTION,
and PERCEPTION,,
systems
communicate
on the TTY and modem
ports via the standard
7-bit ASCII code, using one
start bit, one stop bit, and one parity
bit. Both
systems
transmit
even parity and ignore parity on
the receive side.
3.02
Prior to switching
on the PERCEPTfONe
or
PERCEPTION,,
system, data terminal,
ormodem
power, all speed settings should be made and data
terminals
and modems
should be set for full duplex
operation.
2-1
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