Electrex X3M, Руководство пользователя

Страница: 48 / 152

Pag. 48 di 152
•
“Write General File”.
•
“Read General File”.
The data on disk are organized in record files, according to ModBus standard.
−
Files Structure
Each file is identified by a numeric index of 2 bytes (FILE NUMBER, from 0 to
65535).
It can store a maximum of 10000 records, addressed from 0 to 9999.
Each record cannot be more than 238 bytes.
7.1.2 Options
7.1.2.1 RS485 Port
RS485 optically insulated interface module with programmable speed from 2400 bps to 38400 bps.
It is connected to the instrument via a connector and then can be easily fixed at the back with screws.
It can be network connected with other instruments up to 1000 m maximum distance and up to 128
instruments. For longer distances or more instruments, an amplifier is necessary.
7.1.2.2 RS232 Port
RS232 optically insulated interface module with programmable speed from 2400 bps to 38400 bps.
It is connected to the instrument via a connector and then can be easily fixed at the back with screws.
7.1.2.3 2 x 4-20 mA Analog Output
4-20 o 0-20 mA analogue double output, galvanically insulated with high precision and reliability.
The output is the result of a conversion from digital to analogue with definition higher than 10 bit,
maintaining the original measurement accuracy.
The two outputs can be linked to any measurement parameter with update every 200 ms on primary
parameters.
For the average power the output update is every minute due to the parameter itself.
It can be set to a 0 value (4 or 0 mA) a positive or negative value of the selected parameter and to
nevertheless set to 20 mA end of scale, a lower value than the instrument end of scale. The end of scale
provides for an operation margin up to 24 mA.
If the parameter has a value different from the set ones, the output will be 0 mA.