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4.2.2
IEEE-488 (GPIB)
The molbox1+ IEEE-488 interface is located on the rear panel. The physical and electrical
interface conforms to IEEE Std 488.1-1987 Subset E2 and IEEE Std. 488.2-1992. You should
NOT attempt to communicate with the IEEE-488 interface while using the COM1 interface.
The IEEE-488 receive buffer is 250 bytes deep. The molbox1+ will hold OFF release of the
NRFD handshake line until it can service and empty the receive buffer. This keeps the buffer
from overflowing.
IEEE-488 commands must be terminated with a single line feed character along with the
assertion of the EOI line. All IEEE-488 responses from the molbox1+ are terminated with a line
feed character along with the assertion of the EOI line. Replies are held in a buffer until the
host computer gets them, so it is possible to have old replies in this buffer, while you are
expecting new replies from a just issued command.
4.3
Commands
4.3.1
Command Syntax
All molbox1+ commands are ASCII strings. The user must wait for the molbox1+ to reply before
sending another command. An exception to this is the use of any of the IEEE STD. 488.2
Common Commands via the IEEE-488 interface (these Common Commands are shown first,
and always start with an asterisk, "*"). The common commands only generate a reply if using
the COM1 port or the query form of the common command is used (command followed by a "?").
4.3.2
Command Summary
SYNTAX
*CLS
*ESE(?)
*ESR?
*IDN?
*OPC(?)
*OPT?
*RST
*SRE(?)
*STB?
*TST?
#
AUTOZERO(=)
ABORT
AIRW
ALLR
BEEPER
BPR(=)
CIN
COMn(=)
COUT(=)
DATE(=)
IBM PC/XT DB-25F TO DB-9M
CONNECTIONS
DB-25F
DB-9M
2
3
3
2
7
5
Table 38. Command Summary
Read or set the Operation Complete register (not applicable to the molbox1).
Send a command string out of the molbox1+ COM2 port.
Read or set the status of the reference pressure transducers (RPTs) "AutoZ" function
Stop an active averaging, tare, leak check or purge cycle.
Read the next measurement of molbloc flow, the molbox1+ up and downstream
To actuate the internal buzzer for half of a second.
Read or set the back pressure ratio mode when using a sonic nozzle
Read the MFC measurement current if in 'mA' mode.
Read or set the configuration of the COM1 or COM2 port.
Read or set the current for an external MFC if in "mA'' mode.
Page 113
© 1995 - 2010 Fluke Corporation, DH Instruments Division
4. REMOTE OPERATION
IBM PC/XT DB-9F TO molbox1++
DB9M
CONNECTION
DB-9F
3
2
5
PURPOSE
Clears the status registers and all queues.
Read or set the Event Status Enable register.
Read the Event Status Register.
Identify the product and software version.
Read the molbox1+ options installed.
Reset user settings to factory defaults.
Read or set the Service Request Register.
Read the Status Byte.
Read the system self-test results.
Read or set the humidity ratio of the gas, AIR
RPT pressure values, and molbloc temperature.
Read or set the internal clock's date.
DB-9M
3
2
5
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