Table of Contents
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Commands
Disconnect (DISC)
Transmit (TC)
Receive (RC)
Auto -Call
~
CC)
Acknowledge
~CKC)
End Character
(ECC)
Terminate (TERC)
Command Signals
Communication Buffers
•
The CCM encodes the COM 1, 2, and 3 signals to the buffer to accomplish
the following buffer functions.
•
This command causes the buffers to break an existing line connection.
DISC results from a Disconnect Write Control or Operational Word. (See
tables 3-5 and 3-6.)
•
This command conditions a buffer for transmission. TC results from a
Write command or a Suppress Start/Stop Write Control command.
•
This command conditions a buffer to receive data. RC results only from
a Read Forward commando
•
This command enables buffers with auto-call capability to transfer
dialing digits to an automatic calling unit where applicable. ACC results
only from an Auto-Call Write Control command.
•
This command causes certain buffers to generate and transmit a timed
acknowledgement signal. ACKC results from an acknowledge Write Control
or operational word.
•
This command is controlled by systems classification and is presented
along with the last signal element of each character when transmitting
(asynchronous systems) and during the SEL interval in which the next to
the last signal element is transferred to the CCM when receiving (syn-
chronous systems). This command is spontaneously generated by the CCM
as a result of its character serializing and assembly functions during the
buffer scan. If any other command is to be issued during the same SEL
interval, the ECC is surpressed. The ECC does not cause the buffer to
change its command state.
At the present time, the ECC is applicable to only the 70/722 Synchronous
Transmitter Receiver Buffer during receiving and the 70/720-11 Asyn-
chronous Data Set Buffer when transmitting (TWX applications).
•
This command, which is presented with the last bit when transmitting, or
at any time when receiving, causes the buffer to conclude the operation
speCified by the previous command and to respond to SEL with END when
it can accept a new command. TERC results from command termination or
operational word.
•
The bit configurations of the COM 1, 2, and 3 signals from the CCM to
buffers are:
Out of Service (OSC) (70/715 Parallel Buffer)
The function of an OSC is to condition the data set to appear out of ser-
vice or busy to an incoming call. This command requires that DTR to
the data set be off.
Call Attendent (CAC) (70/715 Parallel Buffer)
A CAC causes the buffer to signal for attendent intervention on any par-
ticular call. This command requires that DTR to the data set be one.
4-2
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