7.1 Setting up the RS-232 Port for Remote Control
Note: The RS-232 connection cable should not exceed 15m unless the load
capacitance measured at connection points is less than 2500pF.
Serial parameter values:
9600 baud
8 data bits
1 stop bit
no parity
Xon/Xoff
EOL (End of Line) character or CR (Carriage Return) or both
To set up remote operation of the calibrator on the Windows Hyper Terminal,
connected to a COM port on the PC as in Figure 23, use the following
procedure:
1. Start Hyper Terminal (located in Accessories/Communications of the
Windows Start menu)
2. Select New Connection.
3. For Name enter ASC300. Select the serial port that the unit is connected
to.
4. Enter the above information for port settings.
5. Select ASCII setup from File/Properties/Settings and mark these
choices:
Echo typed characters locally
Wrap lines that exceed terminal width
6. Select Ok
7. To see if the port works enter *IDN?. This command will return
information on the unit.
7.2 Changing Between Remote and Local Operation
There are three modes of operation of the calibrator, Local, Remote, and
Remote with Lockout. Local mode is the default mode. Commands may be
entered using the keypad on the unit or using a computer. In Remote mode
the keypad is disabled, and commands may only be entered using a
computer, but choosing [GO TO LOCAL] from the menu on the calibrator
display will restore keypad operation. In Remote with Lockout, the keypad
can not be used at all. To switch modes proceed as follows:
1. To enable Remote mode, type in the serial command REMOTE at the
computer terminal.
2. To enable Remote with Lockout, type in REMOTE and LOCKOUT in either
order.
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