
The RTS (Request To Send), is an output from the HP
which
can be used to control incoming data flow.
A
true on the RTS line
the controller to send data and a
on this
signals a request for the
controller to disable data transmission.
The CTS (Clear To Send), DSR (Data Set Ready), and DCD (Data
Carrier Detect)
are inputs to the HP
which control data
flow from the HP
(Pin 2). Internal
resistors in the HP
assure the DCD and DSR
remain high when they are not
connected. If DCD or DSR are connected to the controller, the
controller must keep these
and the CTS Iine high to enable the HP
to send data to the controller. A low on any one of these
disable the HP
data transmission. Dropping the CTS
low during data transmission
stop HP
data transmission
immediately. Dropping either the DSR or DCD
low during data
transmission
stop HP
data transmission, but as many as
two additional bytes may be transmitted from the HP
Cable Example
Figure 2-l is an example of how to connect the HP
to the
HP
Interface card of an HP 9000 series
controller. For
more information on cabling, refer to the reference manual for your
specific controller.
Since this example does not have the correct connections for hardware
Note
handshake,
protocol must be
used
when connecting the
HP
as shown in figure 2-l
Programming
Over RS-232C
3-4
Figure 2-1. Cable Example
HP
1651B
Programming Reference
Содержание 1650B
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