Lock ACIA Settings
Lock/unlock the ACIA settings in the M553 transducer.

A few seconds after being connected to a live Modbus network, the transducer will configure itself to the network’s settings. i.e. baud rate, parity, stop bits.
If the transducer detects 5 consecutive framing errors, it will start to search using different parity settings until the errors stop.

If the transducer detects 5 consecutive CRC errors, it will start to search using different baud rate settings until the errors stop.
To prevent unnecessary hunting the settings can be locked into the EEPROM and will always be used unless they are unlocked again.
In addition to the General Pass Code being valid, another code, found below, needs to be sent as data with this function.

Unlock using a value of zero in the data slot of the packet.

Sample Coding
Slave Address = 1
Writing To 4X Registers - code 16 (10 hex) Address 60h

Message Packet To SLAVE
01 10 00 60 00 02 04 46 A3 50 00 2C ED
N.B. 46 A3 50 00 = 20904

Response Packet From SLAVE
01 10 00 60 00 02 41 D6