Gossen MetraWatt 62 N Series Operating Instructions Manual Download

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GMC-I Gossen-Metrawatt GmbH

Programming

The device is furnished with three 8-bit event registers, each of
which can be individually queried. When an event register is
queried, its content is deleted. The *CLS command (CLEAR
STATUS) can be used to clear all event registers.

Each response consists of a whole number 0

≤

255, where

corresponds to the decimal equivalent of the content of the
respective register.

An enable register is assigned to each event register.

*IDN? – Device Identification Query

Functions

In response to this query, the device identifies itself by providing
information regarding manufacturer, type designation, serial
number, hardware revision level and firmware revision level.

Programming

Query command:

*IDN?

Response string:

manufacturer,type,serial_number,hardware_revision.software_revision

Fixed response string length: 49 characters

Example:

GOSSEN-METRAWATT,SSP62N052RU050P,
EM0000233,03.001

*IST? – Individual Status Query

Functions

– Command for directly querying parallel poll information (see

also chapter 6.2 and table “Query Command for Status and
Events Management” on page 87).

– Current status of the device’s IEEE488.1 “IST” message.

– Content is not changed by the query.

– An ASCII coded byte is returned as a response.

When using the RS232 interface

without

the IEEE488 interface,

value 1 is generally returned as a response.

Programming

Query command:

*IST?

Response string:

0 : “Local message is false”

1 : “Local message is true”

Length:

1 character, fixed

Example (HP Basic):

OUTPUT 713;"IST?"
ENTER 713;A$
DISP A$

→

Display:

*LRN? – Complete Configuration Query (LEARN)

Functions

In response to the *LRN? query command, the device supplies a
complete list of all adjustable functions along with current
parameter settings.

Applications

This function allows the controller to acquire manually configured
device settings, and to use this information for evaluation or for
remote configuration via the interface.
In this way, for example, a test sequence can first be executed
with all involved devices in the manual operating mode. The
device settings required for the individual test steps are queried
by the controller with the *LRN? command. The response string
received by the controller can then be entered to the test program
in an unchanged fashion, and can be subsequently transmitted to
the respective device as a command string.

Programming

Query command:

*LRN?

Sample response string:

ULIM +035.000;ILIM +050.000;OVSET +050.0
;OCP OFF;DELAY 12.00;USET +021.300;ISET
+048.000;OUTPUT ON;POWER_ON RST;MINMAX
ON;TSET 00.10;TDEF 10.00;REPETITION
000;START_STOP 020,115;T_MODE OUT;
DISPLAY OFF

Fixed response string length: 202 characters

*OPC, *OPC? – Operation Complete Flag Query

Functions

The operation complete flag (OPC) allows for synchronizing the
controller and the device in two different ways:

The OPC bit is set in the ESR event standard register

with the

*OPC command

after all previous commands have been

executed. This can be used to generate an SRQ message
which synchronizes the controller.
Since the SRQ line is only available at the IEC bus, this method
cannot be used for programming via the serial interface.

b) In response to the *OPC? query command,

“1” is written to the

output buffer and the MAV bit is set in the status byte register
after all previous commands have been executed.
Synchronization can be accomplished by reading out this
response, or – in the case of IEC bus operation – by
responding to the SRQ message triggered by the MAV bit, if
appropriate masking exists.

Programming

a) Setting

Setting command:

*OPC

Programming example (HP Basic):

OUTPUT 712;"*ESE 1; *SRE 32"

!OPC bit is enabled for SRQ

:
:
OUTPUT 712;"*CLS 1; *RCL 2; *OPC"

!SRQ is signaled after
!recalled device setting from
!memory # 2 has been set

b) Query

Query command:

*OPC?