Fluke HART SCIENTIFIC 1502A Manuel d'utilisateur télécharger pdf (Page 30)

7.2.1 Setting the Address

The IEEE-488 bus requires that each device has a unique address. The default

address of the 1502A is 22 but can be changed if necessary. The IEEE-488 ad

dress of the 1502A is set within the Comm menu after the serial linefeed pa

rameter. (This menu option will not appear if the IEEE-488 interface is not

installed). Press the Menu button (“SEt?” appears) then press the Comm but

ton. The display will briefly indicate “SErIAL”, then “bAUd” and then display

the current baud rate. Press Enter several times until “IEEE”appears.Thedis

play will briefly indicate “AddreSS” and then display the current IEEE-488

address. Use the U and D buttons to change the number then press Enter.

7.2.2 Setting the Termination Character

The 1502A will normally terminate transmissions from the IEEE-488 port with

a linefeed (newline) character. Some systems may require a terminating car

riage return instead. The termination character can be changed if necessary. The

termination character is set within the Comm menu after the IEEE-488 address

parameter. (This menu option will not appear if the IEEE-488 interface is not

installed). The display will briefly indicate “EOS” (end of string) and then dis-

play the current setting. Use the U and D buttons to change the termination

character then press Enter.

7.2.3 Time Stamp

Measurement data read from the GPIB interface can be stamped with the

time-of-day. For instructions on setting the time stamp and system clock see

Section 7.1.3 above.

7.3 Remote Commands

ASCII commands are used to instruct the 1502A to perform certain actions. Ta

ble 6 provides a complete list of commands. These commands can be used with

either the RS-232 or IEEE-488 interface. All commands sent to the 1502A

must be terminated with a carriage return or linefeed. Either upper or lower

case letters are accepted. Commands used to set a parameter are issued with the

command header, an “=“ character, and the parameter value. For example,

U=C<EOS> sets the units to Celsius. (The symbol <EOS> represents the termi

nation character.) Commands used to request data are issued with only the

command header. For example, T<EOS> causes the 1502A to return the most

recent measurement. Basic operations using commands are explained in the fol

lowing sub-sections.

7.3.1 Measurement Commands

The following commands relate to reading measurement data.

1502A Thermometer Readout

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Fluke HART SCIENTIFIC 1502A Manuel d'utilisateur Page 30