Filter
Top Products
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 U and D buttons to
change the state and press Enter. ON enables transmission of the time stamp
and OFF disables it.
The time stamp 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 stamp parameters affect the time stamp of data read through
both the RS-232 and IEEE-488 interfaces.
7.1.4 Duplex Mode and Linefeed
Commands sent to the 1504 through the RS-232 interface are normally echoed
back to the remote device. 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 duplex setting. Use the U and D buttons to set duplex to
“HaLF”or“FULL”thenpressEnter.
Duplex can also be set using the “DU” communications command. The com-
mand DU=H<EOS> sets duplex to half and DU=F<EOS> sets duplex to full.
Transmissions from the 1504 through the RS-232 interface are normally fol-
lowed by a linefeed character (ASCII decimal 10). The linefeed character can
be disabled by setting the linefeed “LF” parameter to “OFF”. The linefeed pa-
rameter is found in the Comm menu after the duplex parameter. The display
will briefly indicate “LF” and then display the current linefeed setting. Use the
U and D buttons to set linefeed “On”or“OFF”thenpressEnter.
The linefeed can also be set using 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 available with an optional IEEE-488 (GPIB) port. The IEEE-488
interface is useful when one computer needs to control and collect data from
many instruments simultaneously. The IEEE-488 connector is located on the
back panel of the 1504 above the RS-232 connector. To eliminate noise, the
GPIB cable should be shielded.
The 1504 is equipped with basic communication capabilities as 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 accepts the DCL and SDC clear
commands. The 1504 does not respond to trigger (GET), serial poll, parallel
poll, or remote/local commands and is not capable of talk-only mode.
27
7 Digital Communications Interface
GPIB Interface