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VISA Resource Name
Because of the limited support for VXI-11(Discovery Protocol only), the instrument must be
referred to by its raw socket information when used in software packages which communicate via a
VISA resource name. For example, an instrument at IP address 192.168.1.100 would normally
have a VISA resource name of "TCPIP0::192.168.1.100::inst0::INSTR" but for this instrument the
name must be modified to read "TCPIP0::192.168.1.100::9221::SOCKET" where 9221 is the TCP
port used by this instrument for control and monitoring, see below.
XML Identification Document URL
As required by the LXI standard, the instrument provides an XML identification document that can
be queried via a GET at “http://<hostname>:80/lxi/identification” that conforms to the LXI XSD
Schema (available at http://www.lxistandard.org/InstrumentIdentification/1.0) and the W3C XML
Schema Standards ( http://www.w3.org/XML/Schema ). This document describes the instrument.
TCP Sockets
The instrument uses 2 sockets on TCP port 9221 for instrument control and monitoring. Text
commands are sent to this port as defined in ‘Remote Commands’ and any replies are returned via
the same port. Any string must be one or more complete commands. Commands may be
separated with either semicolons “;” or line feeds. No terminator is required since the TCP frame
contains complete commands though commands may be sent with a terminator if desired (it will be
ignored). Each command over TCP behaves as if it is terminated with a command terminator
(ASCII character 0AH, line feed).
GPIB Interface
(QPX600DP only)
The GPIB interface 24-way connector is located on the instrument rear panel. The pin connections
are as specified in IEEE Std. 488.1-1987 and the instrument complies with IEEE Std. 488.1-1987
and IEEE Std. 488.2-1987.
GPIB Subsets
This instrument contains the following IEEE 488.1 subsets:
Source Handshake
SH1
Acceptor Handshake
AH1
Talker
T6
Listener
L4
Service Request
SR1
Remote Local
RL2
Parallel Poll
PP1
Device Clear
DC1
Device Trigger
DT0
Controller
C0
Electrical Interface
E2
Query Error Register - GPIB IEEE Std. 488.2 Error Handling
The IEEE 488.2
UNTERMINATED
error (addressed to talk with nothing to say) is handled as follows.
If the instrument is addressed to talk and the response formatter is inactive and the input queue is
empty then the
UNTERMINATED
error is generated. This will cause the Query Error bit to be set in
the Standard Event Status Register, a value of 3 to be placed in the Query Error Register and the
parser to be reset. See the Status Reporting section for further information.
The IEEE 488.2
INTERRUPTED
error is handled as follows. If the response formatter is waiting to
send a response message and a
<PROGRAM MESSAGE TERMINATOR>
has been read by the parser or
the input queue contains more than one END message then the instrument has been
INTERRUPTED
and an error is generated.
