Super Systems AC20 RS485 Modbus - Manual (Page 14)

Page 14/59
TITLE: MODBUS/J-BUS Protocol for SSi’s- AC20 ENG. 824E REV. 1
8. Security code mode
The security code parameters are represented by words only.
They are always available as read.
They are available as writing only if the device is in security code mode.
To modify the security code parameters via serial link, it is necessary to set the slave in
remote (ModBus bit 218). Then, set the slave in security code mode (send the safety
lock combination value for configuration mode to ModBus word 348 *).
The display will show:
Scrt
COnF
To return in control mode condition, send 1 to ModBus word 3051. The slave will reset
and restart in control mode condition.
* If the value of safety lock combination for configuration mode is 0, all values will be
accepted. If the value is 1, no value will be accepted.
The safety lock combination is the value set at ModBus word 4000.
9. Software key for lock/unlock
Software keys can protect the modification of the parameters.
There is a key to protect the access to configuration mode and security code mode.
There is a second key to protect the modification of control mode parameters.
Once the control mode key is programmed, it is possible to decide which menus will be
protected and which menus will not be protected.
Keys management via serial link
Set the slave in remote (ModBus bit 218).
Set the slave in security code mode (send the present safety lock combination value for
configuration mode at ModBus word 348).
Set the new safety lock combination value for configuration mode at ModBus word
4000.
Set the new safety lock combination value for control mode at ModBus word 4001.
To protect control mode menus with the key, write 1 (key protected) in Modbus words
4002
÷
4011. Write 0 (free) if no key protection is needed.