RCA 70/700 Series Reference Manual page 100

STRB Options
(Cont'd)
Communication
Equipment Options
70/722 Synchronous
Transmitter -Receiver
Buffer
*Ha If-Duplex , Four-Wire - This mode of operation is employed for
fast-turnaround when operating half-duplex, four-wire. The effect of the
option is as follows:
1. Transmit - Upon initiation,RS and DTR are turned on; and RDY is
enabled when DSR and CTS are ono Upon termination, RS remains
on; and END occurs after the last bit is transmitted.
2.
Receive - Upon initiation, RS and DTR are turned on; and RDY is
permitted when DSR and DCD are on. Upon termination, END occurs
immediately.
Speed Selection -
At installation, the STRB must be connected to the
proper modulation rate oscillator in the CCM.
• The communication equipment options upon request, by the common-
carriero
At installation, the data set must be conditioned as follows:
1.
AT&T 201A3 or 202C - Automatic answering - controlled by
AUTO key.
20
AT&T 201B or 202D - Condition for two-wire or four-wire
(simultaneous) operation.
*This option can only be used when the remote transmitter-receiver
provides sufficient turnaround delay to allow for command termination
and initiation by the CCM and program. Typically, IBM STR equipment
does not provide sufficient delay.
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