Caen ELS LiAM 6005 User Manual page 54

Remote Control
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
The set_reg structure, in order to set the desired behaviour must be interpreted
as follows:
FDB command register (8bit):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3...0
The "BYPASS COMMAND" bit (bit 7 - i.e. MSB) was especially
implemented in order to use the 'FDB' command also as a simple read command: by
setting this bit the power supply ignores all other data contained in the set_reg and in
the i_set fields, thus replying and giving information on its internal status_reg, i_set
and i_read.
Thanks to this feature the power unit can be controlled only with a single
command, thus reducing driver (or EPICS IOC) complexity and maximizing
bandwidth.
Example:
Suppose that the LiAM power supply unit is turned on and it is regulating a 4.5000A
output current (on a 15Ω resistive value).
The user then sends the following command:
FDB:50:-01.2453\r
After sending the FDB command, the PS turns on (it was already ON in this
example) and sets its current to -1.2453A reaching this setpoint with a ramp (defined
by the slew rate value stored in the power supply non-volatile memory).
LiAM User's Manual
CROWBAR
OVER-TEMPERATURE
AC FAULT
FAULT
MODULE ON
Bit Function:
BYPASS COMMAND
ON/OFF
RESET
RAMP
don't care
#FDB:6001:-01.2453:+04.5002\r
54