EASY-DRIVER – User’s Manual
26
3.4
Status Register
Each EASY-DRIVER unit has an internal 8-bit status register that contains all
useful information about the power supply operation; this register is updated in real-
time and it is always accessible by the users via the remote connection.
The internal status register structure is presented in
Table 5
(bit 7 is the MSB and
bit 0 the LSB):
Status bit
Cell Caption
7
reserved
6
reserved
5
EXTERNAL INTERLOCK
4
SHUNT TEMPERATURE
3
MOSFET TEMPERATURE
2
DC UNDERVOLTAGE
1
FAULT
0
MODULE ON
Table 5:
8-bit internal status register
The status register value can be directly read by users using the ‘MST\r’
command. The returned item is a 2-digit hexadecimal ASCII string, corresponding to
the equivalent status register. A brief description of all the binary flags is here
presented:
-
Module ON
–
bit 0
: this bit is set if the module is enabled and correctly
regulating output current;
-
Fault
–
bit 1
: this bit is set if the module has experienced a fault – e.g. generated
by an external interlock or an internal protection trip – and the status register has not
been reset;
-
DC Undervoltage
–
bit 2
: this bit is set when a DC–Link under-voltage
condition – i.e. voltage drops below a user-defined threshold – has been recognized.
The setting of this bit implies the simultaneous setting of the fault bit;
-
MOSFET Temperature
–
bit 3
: this bit is set when a MOSFET over-
temperature condition has been experienced. The setting of this bit implies the
simultaneous setting of the fault bit;
-
Shunt Temperature
–
bit 4
: this bit is set when a shunt case over-temperature
condition has been experienced. The setting of this bit implies the simultaneous setting
of the fault bit;
