Using The Serial Port - HP 8711C User Manual

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Like the parallel port, the RS-232 serial port can also be accessed using SCPI
and ll3ASIC commands.
serial port, use one of the following commands:
OUTPUT QRfna;"DIAG:PORT:WRITE 9,0,52"
lb read a byte from the serial port, use the following commands:
OUTPUT ORfna;"DIAG:PORT:READ? 9,O"
ENTER ORfna;Serial,in
S e r i a l - i n = READIO(9,O)
For general purpose l/O, the parallel port is much easier to interface to than
the serial port. To interface to the serial port, a Universal Asynchronous
Receiver Transmitter (UART) is typically used to decode the RS-232 signals.
Most UAR'fs are designed to be used with microprocessors.
The advantage of the serial port is that it can operate over long distances, up
to 30 meters using the RS-232-C standard. Its disadvantage is its slow speed;
limited to 19200 bits/second.
Before using the serial port, you must select the baud rate and handshake
style using the SCPI commands:
One type of application for the serial port would be to use it for data logging
to a remote computer. After each device is measured, an ll3ASIC program
could use the WRITE10 command shown above to send a brief summary
of the measurement result, such as a filter's 3 dl3 bandwidth and its serial
number, to the remote computer. A program on the remote computer would
monitor the serial port and read the incoming data and archive it to hard disk
or the network.
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