Asynchronous Line Operation - Fdx Communication Facility, Prts, Hdx Control Unit - IBM 3708 Description

Asynchronous Line Operation - FDX Communication Facility, PRTS, HDX Control Unit
DTR - '
DSR~
1
RTS
.-J
2 3
CTS
I
4
8
TxD
I
I
5 6
7
RxD
I I
1
3708 activates RTS at line enable time
<
PRTS
> .
2
3708 has data to transmit - CTS is monitored and must be presented within 40 seconds.
3
Modem presents CTS.
4
3708 transmits data.
5
3708 begins receiving data.
6
3708 has data to transmit. Data is held pending line turnaround.
7
Receive operation completes. 3708 receives line turnaround characters.
8
3708 transmits data.
Figure 2-17. Asynchronous Line Operation - FDX Communication Facility, PRTS, HDX
Control Unit
2-26
IBM 3708 Description