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Cable Example
Note
Programming Over RS232C
3-4
The RTS (Request To Send), is an output from the HP 1652B/53B which
can be used to control incoming data flow. A true on the RTS line allows
the controller to send data and a false on this line signals a request for the
controller to disable data transmission.
The CTS (Clear To Send), DSR (Data Set Ready), and DCD (Data
Carrier Detect) lines are inputs to the HP 1652B/53B which control data
flow from the HP 1652B/53B (Pin 2). internal pull-up resistors in the
HP 1652B/53B assure the DCD and DSR lines remain high when they are
not connected. If DCD or DSR are connected to the controller, the
controller must keep these lines and the CTS line high to enable the
HP 1652B/53B to send data to the controller. A low on any one of these
lines will disable the HP 1652B/53B data transmission. Dropping the CTS
line low during data transmission will stop HP 1652B/53B data
transmission immediately. Dropping either the DSR or DCD line low
during data transmission will stop HP 1652B/53B data transmission, but as
many as two additional bytes may be transmitted from the HP 1652B/53B.
Fiie 3-l is an example of how to connect the HP 1652B/53B to the
HP 9S62SA Interface card of an HP 9000 series 2W3OO 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
handshake, XON/XOFP protocol must be used when connecting the
HP 1652B/53B as shown in figure 3-l
Figure 3-l. Cable Example
HP 16528/16538
Programming Reference
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