Computer Operations 4

Testing the Instrument/PC RS-232 Interface

Mn.n identifies the main software version.

An.n identifies the analog-to-digital converter software version.

Dn.n identifies the display software version.

Ln.n identifies the programmable gate-array configuration version.

6.Other commands can be entered from the PC to gain familiarity with the instrument command set. All commands are summarized in Table 4-4 and explained in Table 4- 5.

For example: to reset the instrument, configure channel 0 to measure volts dc using the 300V DC scale (scale 4), send scan results to the RS-232 port, and scan once, enter the following:

*RST[Resets the instrument (which does not affect the communication parameters)] =>

FUNC 0, VDC, 4[Set channel 0 to volts dc and scale 4 (300V DC)] =>

PRINT_TYPE 0,0[Sets the data destination as the RS-232 port, and all data] =>

PRINT 1[Enables data logging to the RS-232 port] =>

*TRG [Triggers a single scan] => 15:17:0407/21/94

0:000.00 VDC ALM:15DIO:255TOTAL:0

To decode the printout, see Figure 5-3.

The commands in the above example can be combined into a single entry by using the semicolon separator character:

*RST;FUNC 0,VDC,4;PRINT_TYPE 0,0;PRINT 1;*TRG.

7.One of the following three possible prompts are returned when a command is sent to the instrument:

=> The command was executed[Example, PRINT 1].

!> The command was recognized, but not executed [Example, PRINT 3, where only PRINT 0 and PRINT 1 are legal entries].

?> The command wasn’t recognized [Example, PRITN 1, spelling error].

8. Exit Windows and return to DOS, as required.

Testing the RS-232 Interface Using Terminal Emulation (Generic)

Complete the procedure below to test the RS-232 link between the PC and instrument using a generic terminal emulator. Refer to the documentation appropriate to the selected communications/terminal emulation software, as required. Identify the PC COM port used for the RS-232 link (COM1 is assumed).

4-7

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Fluke 2635A user manual Rstfunc 0,VDC,4PRINTTYPE 0,0PRINT 1*TRG

2635A specifications

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