Burkert Type 8056 - Manual (Page 20)

- 20 - RS232_485_ETP_MODBUS_BU_REV02.doc
e) - Command for resetting the current batch process:
Command code: 08
Command format: ADDRESS TO
+ ADDRESS FROM
+ 08H
+ 01H (1 DECIMAL)
+ OPCODE byte = 82H (130 DECIMAL)
+ CRC CHECKSUM
Format of the returned data: 1 byte containing the batch process state as described above. This command resets the
dosing quantity and the safety timer counters.
3.3. ETP PROTOCOL (ENCAPSULATED TRANSFER PROTOCOL)
3.3.1. INTRODUCTION
The ETP is a protocol owner of the converter that has the function of the read and set the parameters of the
converter through formatted strings of characters.
3.3.2. DATA WORD FORMAT
The data bytes travelling in serial form on the communication line are enclosed in words which have a fixed length of
10 bits:
1 START BIT
8 DATA BITS = 1 BYTE DI DATI
1 STOP BIT
Each word contains one byte of data plus additional bits which serve to synchronise and make the communication
safer. These extra bits are added automatically in the transmission phase by the transmitter integrated circuit. In the
reception phase, the reverse operation is executed by the receiver integrated circuit: the eight data bits are extracted
and the others are eliminated. These operations are executed entirely on a hardware level.
The 8 data bits must be serialised staring from bit 0 (the least significant one).
3.3.3. COMMUNICATION SPEED
The millennium series instruments have 4 communication speeds::
• 4800 bps
• 9600 bps
• 19200 bps
• 38400 bps