Super Systems AC20 RS485 Modbus - Manual (Page 13)

Page 13/59
TITLE: MODBUS/J-BUS Protocol for SSi’s- AC20 ENG. 824E REV. 1
6. Control mode
“Control mode” indicates the normal functioning status of the device
(indicator/controller).
In control mode they are parameters (menu groups), variables and status.
The parameters (Menu groups) are represented by words only.
Bits and words represent the variables and the status.
Reading:
The parameters (menu groups) are available only if they are meaningful in the present
contest.
The variables and the status are available only if the device is in control mode and if
they are meaningful in the present contest
Writing:
All the addresses are available only if the device is in control mode, in remote mode, in
unlock condition (see note 9) and if they are meaningful in the present contest
7. Configuration mode
The configuration parameters (Menu conf.) are represented by words only.
They are available as read only if they are meaningful in the present contest
They are available as writing only if the device is in configuration mode, and they are
meaningful in the present contest
At the end of the parameters programming of a configuration menu it is opportune to
send the “end of configuration menu” command (ModBus words 3000 ÷ 3005). The
congruence of the programmed data compared with the data of the other configuration
menus is checked. In case of non compatibility, the reply will include a 1xx error
message where xx represents the number of the menus whose closure has caused the
error.
The end of the group programming is anyway automatically sent if data of a different
menu are programmed or read and if the output of the configuration mode is imposed.
To modify the configuration parameters via serial link, it is necessary to set the slave in
remote (ModBus bit 218). Then, set the slave in configuration mode (send the safety
lock combination value for configuration mode to ModBus word 347 *).
The display will show:
SEr
COnF
To return in control mode condition, send 1 to Modbus word 3051. The slave will reset
and restart in control mode condition.