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8808A
Users Manual
4-6
Character Echoing and Deletion
When the Meter is operated via the RS-232 interface, you can control whether characters
are echoed to the host's display screen.
When Echo is on, characters sent to the Meter are echoed on the host's display screen and
prompts are returned. When Echo is off, characters are not echoed, and prompts are not
returned. To set the Echo parameter, refer to the “Setting Communication Parameters
(RS-232)” section earlier in this chapter.
If you send a character to the Meter over the RS-232 interface directly from a keyboard,
pressing the <BACKSPACE> key deletes the previous character. A backspace is echoed
to the display screen if Echo is on.
Device Clear Using ^C (CNTRL C)
^C (CNTRL C) causes “=>” followed by a carriage return and line feed to be output.
RS-232 Prompts
When the host sends a command to the Meter over the RS-232 interface, the Meter parses
the command, executes it, returns a response (if appropriate), and then sends one of the
following prompts:
=> No errors detected. Command was successfully parsed and executed. The
interface is ready for another command.
?> Command error detected. Command was not executed because it was not
understood. For example, the Meter received an input string that contained a
syntax error.
!> Execution error or device-dependent error detected. Command was understood,
but not executed. For example, user attempted to use FREQ to perform a VDC
measurement.
Getting Started with an Installation Test
After the Meter is cabled to a host per “Cabling the Meter to a Host or Printer (RS-232)”
and is prepared to communicate with the host via the RS-232 interface, test the system as
follows to verify that it is operational.
Installation Test for RS-232 Operation
This procedure confirms that the Meter is properly set up and cabled for remote
operations:
1. Press P to turn the Meter on.
2. Verify that the computer interface parameters (baud, parity, etc.) are set correctly.
3. Turn the host on.
4. Type *IDN? and press Enter.
5. Verify that the Meter sends the following response:
FLUKE, 8808A, nnnnnnn, n.n Dn.n
Where nnnnnnn is the Meter’s serial number; n.n is the main software
version; and Dn.n is the display’s software version.
6. If the Meter does not respond as indicated, refer to the “If Test Fails” section.
1.888.610.7664 sales@GlobalTestSupply.com
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