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

Asynchronous Line Operation - FDX Communication Facility PRTS - FDX Control Unit
DTR
---1
DSR
.-J
1
RTS
I
3
eTS
I
2 4 6
TxD
I I
5
RxD
I
1
3708 activates RTS at line enable time.
2
3708 has data to transmit, walts up to 40 seconds for CTS.
3
CTS is presented to 3708.
4
3708 begins transmitting data.
5
3708 receives data from remote device.
S
3708 finishes transmitting data.
7
3708 has more data to transmit.
8
71
8
3708 transmits data even though it is receiving data because this control unit Is defined as FOX.
Figure 2-19. Asynchronous Line Operation - FDX Communication Facility PRTS - FDX
Control Unit
2-28
IBM 3708 Description