18
GOSSEN METRAWATT GMBH
9.1
Activating the Default Values
Previously entered changes can be undone, and the default
settings can be reactivated. This may be advisable under the
following circumstances:
•
After the occurrence of software or hardware errors
•
If you are under the impression that the calibrator does
not work correctly
➭
Simultaneously press and hold the
ESC,
#
and
"
keys,
and switch the instrument on with the
ON|OFF
key.
9.2
Transmission Mode Operation with RS 232 Interface
The calibrator is equipped with a bidirectional infrared inter-
face for communication with a PC. The commands are opti-
cally transferred through the calibrator housing by means of
infrared light to an interface adapter (accessory), which is
attached to the calibrator. The adapter’s RS 232 interface
allows for the establishment of a connection to the PC via an
interface cable.
Commands and parameters can be transmitted from the PC
to the calibrator. The following functions can be executed:
•
Configuration and read-out of calibration parameters
•
Calibration function and calibration range selection
•
Start calibration
•
Programming of user-specific procedures
Configuring Interface Parameters
Addr – Address
If several instruments are connected to the PC via interface
adapters, each device must be assigned its own address.
Address 1 should be used for the first device address, 2 for
the second etc. If only one calibrator is used, an address
between 1 and 14 should be selected.
Address 15 is not used for addressing, i.e. the device with
address 15 always responds, regardless of the actual
address.
Switching the Interface On via PC
After transmission of a data frame from the PC, the simulator
is switched on.
For this reason, the plug type mains supply should be used
for long operational periods. This avoids automatic deactiva-
tion by the battery monitoring circuit.
Operating Controls in REMOTE Operation
When set to REMOTE operation, the instrument reacts like in
local control operation. The instrument is put back into local
control operation after switching it off and on again with the
ON|OFF
key.
LC Display in REMOTE Operation
The commands transmitted by the PC during direct operation
will be executed by the instrument directly, provided the basic
function set by the message complies with the one set on the
rotary switch. The LC display will acknowledge the program-
med signal value and the output type after each message.
Incorrect settings of the rotary switch are signalled by a flas-
hing display of the scheduled basic function. The new com-
mand will be executed immediately when the rotary switch
has been set to the scheduled basic function.
Interface parameters are as follows:
Format:
8 data bits, no parity, 1 stop bit
Baud rate:
9600 baud
Signal LED on the Interface Adapter
One green and one red signal diode on the interface adapter
give you the following information and warnings:
•
Green
LED:
Lights up briefly when commands are transmitted from
the PC to the calibrator.
•
Red
LED:
Lights up during the transmission of messages from the
calibrator to the PC. This occurs each time the calibrator
is switched on and when a message received from the
PC is acknowledged. This response, as well as an
acousting signal, are generated to confirm the correct
physical communication between PC and calibrator.