Fluke 1504 7.2 GPIB Interface

to the time stamp parameter.The display will briefly show “ti Sta” then the

time stamp state which is either ON or OFF.Use the Uand Dbuttons to

change the state and press Enter.ON enables transmission of the time stamp

and OFF disables it.

The timestamp can also be set using the “ST” communications command. The

command ST=ON<EOS> enables the time stamp and ST=OF<EOS> disables

it.

The clock and time stampparameters affect the time stamp of data read through

both the RS-232 and IEEE-488 interfaces.

Commands sentto the 1504 through the RS-232 interface are normally echoed

back to ther emotedevice. To disable this feature set the duplex option to half

instead of full.The duplex parameter is found in the Comm menu after the

sample period parameter.The display will briefly indicate “dUPL”andthen

display the current duplexsetting. Use the Uand Dbuttons to set duplex to

“HaLF”or“FULL”thenpressEnter.

Duplexcan also be set using the “DU” communications command. The com-

mand DU=H<EOS> setsduplex to half and DU=F<EOS> sets duplex to full.

Transmissionsfrom the 1504 through the RS-232 interface are normally fol-

lowedby a linefeed character (ASCII decimal 10). The linefeed character can

be disabled by setting the linefeed “LF” parameter to “OFF”. The linefeed pa-

rameter isfound in the Comm menu after the duplex parameter. The display

will briefly indicate “LF” and then display the current linefeedsetting. Use the

Uand Dbuttons to set linefeed “On”or“OFF”thenpressEnter.

The linefeed can also be setusing the “LF” communications command. The

command LF=OF<EOS> disables the linefeed character and LF=ON<EOS>

enables it.

7.2 GPIB Interface

The 1504 is availablewith an optional IEEE-488 (GPIB) port. The IEEE-488

interfaceis useful when one computer needs to control and collect data from

manyinstruments simultaneously. The IEEE-488 connector is located on the

back panel of the 1504 abovethe RS-232 connector. To eliminate noise, the

GPIB cableshould be shielded.

The 1504 is equipped with basic communication capabilitiesas specified in

IEEE-488.1. The particular capabilities of the IEEE-488 interface are AH1,

SH1, T6, L4, DC1 (TE0, LE0, SR0, RL0, PP0, DT0). Refer to “IEEE Std

488.1-1987". The 1504 can talk and listen and acceptsthe DCL and SDC clear

commands. The 1504 does notrespond to trigger (GET), serial poll, parallel

poll,or remote/localcommands and is not capable of talk-only mode.

7 Digital Communications Interface

GPIB Interface