User guide

Communication protocol Serie30 Page 24/37
5.7 Function 66 : Write and read new device address
Request:
DevAddr 66 NewAddr CRC16_H CRC16_L
Response:
DevAddr 66 ActAddr CRC16_H CRC16_L
Exception error:
3 If message length is incorrect
32 If device is not yet initialised
Note:
This function programmes the device addresses to NewAddr. The address is returned in ActAddr as confirmation. It is to be
ensured that the new address NewAddr is not already in use by another bus user.
Permissible addresses: 1 .. 249. Address 250 is transparent. This means that every device, irrespective of the set address, will
respond to address 250. Consequently, transparent DevAddr = 250 may only be used in stand-alone operating mode!
For the purpose of reading the device address when the address is not known, for example, the value 250 is transferred as
DevAddr and the value 0 is transferred as NewAddr. The current address is then returned in response.
5.8 Function 69 : Read serial number
Request:
DevAddr 69 CRC16_H CRC16_L
Response:
DevAddr 69 SN3 SN2 SN1 SN0 CRC16_H CRC16_L
Exception errors:
3 If message length is incorrect
32 If device is not yet initialised.
Note:
The serial number is allocated at the factory. It consists of 4 bytes and is calculated as follows :
SN = 256
3
* SN3 + 256
2
* SN2 + 256 * SN1 + SN0