Digital Communication
7300A User Manual
6-10
Serial Number (SN) :
Each power units has a unique serial number at the address 65520
Communication software version number (V0)
Board version number (V1) :
This parameter is divided into bytes, Bits 8 to 15 correspond to the board version number
and Bits 0 to 7 correspond to the software version number.
Device Identifier (DI) :
This parameter is a unique factory-configured code
which identified the type of unit.
Modbus functions supported (MF) :
Returns the value 186 (decimal) which means that the product supports the functions 3,7,8,16.
Communication Time-Out (CTO) :
Sets the time (in seconds) for which the interface listens between two validated communica-
tion frames sent to the interface. If the parameter is set to 0 monitoring is disabled.
The time-out is disabled by default (CTO = 0). The authorised values are between 1 s and
65535 s and are stored in permanent memory.
If the time-out is exceeded, the interface behaves as follows :
The green ‘ON/Dxch’ front panel LED, flashes at a frequency of 0.5 Hz, instead of
being steady on. Bit 8 of the General Status Word is set to 1 and will be set to 0
when next read.
Setpoint after time-out (STO) :
used to set the setpoint used if the time-out is exceeded.
Authorised values are between 0 and 255, stored in permanent memory.
The value in the ‘Setpoint after time-out’ parameter is transferred to the active setpoint if its
value is higher.
6.6. Remarks:
If one parameter has no signification for the power unit used, the returned value is ‘1’.
(e.g : Current limitation on front panel on a basic version)
For functioning safety reason, only some changes on the firing and control modes are allowed :
Basic unit (no option except digital comms), or unit with DLF option and overload alarm (ICO),
the digital communication option allows :
For the firing modes : the changes between (AP, FC1, C16, C64 and SCA).
For the control modes : no changes are allowed if the firing mode is a burst firing, on the other
hand, in phase angle the switch from U2 to Open Loop (OL) is allowed.
For other unit configuration the digital communication option allows :
Product name Read Value
7300A
150
