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REMOTES
COMMUNICATIONS COUPLER
The communications coupler adapts the standard
GE/PAC input-output channels and control lines to
the requirements of Bell System 103F, 201A and B,
or 202C and D Data-Phone*s or other equivalent
communication modems. Automatic dial-up and
automatic-answering capabilities are not provided.
Communications Coupler Specifications
Operates simplex (two-wire, one-way) or half-
duplex (two- or four-wire, two-way non-
simultaneous transmission) over asynchronous and
synchronous modems, and connects with them as
specified in EIA RS-232-A. Two simplex modules
will permit four-wire, full-duplex operation.
Provides asynchronous data rates of 150, 300,
600, 1200 or 1800 baud (bits/sec.) and synchronous
rates of 2000 or 2400 baud. Rates are function of
modems and lines used.
Receives data in parallel upon command (OUT
instruction or TOM function) from computer and
transmits serially, low order bit first, to modem;
with start, parity, and stop bits added by coupler.
Collects data serially, low order bit first, from
modem, checking start bit, parity, and stop bit, and
transfers it to the computer upon command. (IN
instruction or TIM function).
Provides signals for the API for finished trans-
mitting and finished receiving. Provides status to
the computer upon command for busy (either sending
or receiving) and presence of parity and other errors
on incoming data.
NOTE: All beginning-of-block, end-of-message,
word or character counting and longitudinal
error checks, when required, are generated
by program.
Communications Coupler Wired Options
Minimum of five to a maximum of twenty-four
bits of data, in one-bit increments.
Synchronous operation with local clock or
modem clock or asynchronous with local clock.
Half-duplex, two- or four-wire; or simplex,
transmit or receive.
"*Trademark American Telephone
&
Telegraph Co.
Communications Coupler Jumper Board Options
Odd or even parity check and generate.
Optional speeds as above.
One, two, or three stop bits.
The communications coupler is used for trans-
mission between the GE/PAC computer and the GE/
PAC remote scanner, the Data-Edit CRT display
and console, and remote computers including GE/
PAC, Datanet 30, GE 100-Line_, GE 400-
Lin~,
and
GE 600-Line systems.
THE GE/PAC REMOTE SCANNER
The remote scanner provides the ability to
monitor and control a process located at a distance
from the computer, over voice-grade telephone
lines, in conjunction with data sets and a GE/PAC
communications coupler. The GE/PAC central
processor can communicate with up to 16 remote
scanners at different locations. The remote scanners
may operate independently, or in a party-line mode,
or in combinations of each with up to four per party
line.
Input and output controllers are similar to those
located at the central processor, except that the
communications channel must be shared. Any or
all of the following may be included:
Analog inputs, up to 512 points, 12 bits
plus sign. (automatic group advance
neither allowed nor useful)
Digital inputs, up to 64 groups, 11 bits
plus validity, with or without change
detection.
Multiple outputs up to 32 groups, 8 bits per
group (analog output resolution limited)
Optionally, multiple outputs, up to 8
groups, 10 bits per group, for use with
analog outputs of 10-bit resolution.
Timed outputs, up to 32 points, pulsed or
timed, up to 63 counts.
Any of the standard GE/PAC peripherals
which operate from the peripheral buffer,
including I/
0
typewriter, but not including
typed inputs from teletypewriter or other
keyboards which do not have a locking
feature. Peripheral ratings are reduced
to 10 char. per second. (15 cps for GE/PAC
I/O typer)
39
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