Fluke RUSKA 7252, User Manual

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RUSKA 7252
Users Manual
5-2
RS-232
The RS-232 interface supports standard serial operation from a computer to a single
Calibrator. RS-232 supports the IEEE-488.2 and SCPI commands. The Calibrator allows
the following port setups:
Baud Rate: 1200, 2400, 9600, or 19200
Data Bits: 7 or 8
Parity: Even, Odd, or None
Stop Bits 1 or 2
Handshaking XON/XOFF
The RS-232 connection is a DB-9P connector found on the back panel of the Calibrator. It is
located on the processor board. The following pins are used; all other pins are reserved
.
Pin # Direction Signal
2 In RXD Receive Data
3 Out TXD Transmit Data
5 —— GND Ground
7 Out RTS Request to Send
Remote/Local Operation
In Local mode, the Calibrator is operated manually through the front panel. Chapter 4
covers local operation. The Calibrator always powers up in the Local mode. In Remote
mode, the Calibrator is operated by a computer connected to an interface. Most functions
that can be performed in Local mode can also be performed remotely.
Remote mode does not automatically disable local operation. The remote interface may
be active while local operations are being done. In cases where full remote control is
required, the following methods may be used.
1.
Issue a Local Lockout (LLO) interface message via the IEEE-488 interface. The
Calibrator will disable the local keyboard until the Go To Local (GTL) interface
message is received or the REN (Remote Enable) line is unasserted. This method
cannot be used on the serial interface.
2. Issue the SCPI command “SYSTEM:KLOCK ON” to lock the local keyboard. The
Calibrator will disable the local keyboard until the command “SYSTEM:KLOCK
OFF” is received.
3. Issue the SCPI command “DISPLAY:ENABLE OFF” or “DISPLAY:TEXT
<string>”. These commands will disable the local display in addition to locking the
keyboard. The command “DISPLAY:ENABLE ON” will restore the local display
and keyboard operation.
Local operation may also be restored by turning the Calibrator off and back on.