PPC3™ OPERATION AND MAINTENANCE MANUAL
© 2002-2007 DH Instruments, a Fluke Company Page 100
PASSTHRU
Purpose To allow the host PC to communicate with a device connected to the PPC3 COM2 port.
Command
Query
“PASSTHRU n
“PASSTHRU?”
Classic “PASSTHRU= n”
“PASSTHRU”
Arguments n: The string to send out of the COM2 port. It must be less than 40 characters long.
Remarks Generally, the PPC3 COM2 port is used for communication with DHI RPM4s used as PPC3
external measurement devices.
The COM2 port can alternatively be used to communicate to another RS232 device (such as
another PPC3). This allows the user to use one COM port or IEEE-488 port on the host computer
to communicate with the PPC3 and another device. The Command format specifies and sends
the argument. A carriage return and a line feed (<CR><LF>) are added to the string that is sent.
The Query format is used to check the PPC3 COM2 receive buffer to see if a message has been
received on COM2 from the device. The message received by the COM2 port must be terminated
with a carriage return or a carriage return and a line feed. Only one message is retained by the
COM2 port. The label “COM2:” precedes the message text. If the COM2 receive buffer is empty,
then the reply is just be ‘COM2:”
Example
(enhanced)
Cmd sent:
Query reply:
Query reply:
“PASSTHRU=VER”
“COM2:DH INSTRUMENTS, INC PPC3 VER1.01a”
“COM2:” (If the COM2 buffer is empty)
Example
(classic)
Sent:
Reply:
Reply:
“PASSTHRU=VER”
“COM2:DH INSTRUMENTS, INC PPC3 VER1.01a”
“COM2:” (If the COM2 buffer is empty)
See Also “#” , “COM2”
PCALn:HI and PCALn:LO (PPC2+ legacy version)
Purpose
This command is included for reverse compatibility with PPC2+, and should only be
used if needed for command compatibility.
Otherwise, use “PCAL:IH” and “PCAL:IL”
Read or set the RPT calibration information.
See the PPC2 or PPC2+ manual for details on the use of this command.
PPC3 does not operate with three specific range (1, 2, 3) on a single RPT. In PPC3, the “n”
prefix corresponding to the H, M or L range on a PPC2 or PPC2+ RPT, is ignored.
See Also “PCAL:IH”, “PCAL:IL”
5.2
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