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INTERFACE TIMING
After receiving the final character transmitted by the 2701,
the 2845 averages 23 ms
in
switching from receive to trans-
mit status to allow for line settling. In addition to this
turnaround time are the following Data Set Adapter turn-
around times:
1. The Western Electric Data Set 202Dl *, when used with
Data Set Adapter 9012 (1200 bps), has a turnaround
time of 200
±
20 ms.
2. The Western Electric Data Set 201 B 1
*,
when used with
Data Set Adapter 9013 (2400 bps), has a turnaround
time of 150 ms, or, when appropriately strapped, has a
turnaround time of 8.5 ms when operating over four-
wire facilities.
*or equivalent
Appendix D. Timing Considerations
2701 LINE TIMEOUT
The 2701 line timeout period must be considered when
programming the 2845. When the 2701 receives no reply
from an addressed 2845 within 2 seconds after transmitting
the last character of a response or sequence, the 2701 times
out and the operation is terminated. It is the responsibility
of the program to reinitiate the operation.
COMMAND EXECUTION TIMINGS
The timing charts shown in Figure 19 may be used to com-
pute programming time for all I/O operations. These charts
should be used in conjunction with the Sequence/Response
Diagrams shown in Figures 6 through 13.
Appendix D. Timing Considerations
55
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