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MODEL 64000
SYSTEM OVERVIEW MANUAL
I
R
\
I
~
I
DEPRESSED
W
To
T1
Tn
.
I
I
J
L
DTR
I
I
I
I
RTS
~
I
~
f+-A-+t
r
I
I
t
CTS
I
I
I
XMIT DATA
TXD
Figure 2-38. Terminal Talker Timing Diagram
Sequence of Major Events
a. The modem DSR line is not connected to the development station and therefore DSR
is ignored as an input.
,r"jf)
b. When
W
is pressed (To), the RTS and DTR line goes true (+12V).
NOTE
RTS can be set true (+12V) at all times by setting Bit 1 to a
logical "1" on Switch S5 (on I/O board).
c. The development station will not send data until CTS is raised true. Modem sets CTS
true (T1). Time A (Modem strap option) is set by user.
2-71
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