CAVRO XP 3000, Operator'S Manual, Page: 40 / 134

Software Communication
3-4
OEM Communication Protocol
OEM communication is a robust protocol that includes automatic recovery from
transmission errors. Table 3- describes each setting within the OEM communication
protocol.
Table 3-3. OEM Protocol (JP1-2, Jumper IN)
Parameter Setting
Character Format
Baud rate 9600 or 38400 (set using JP1-4)
Data bits 8
Parity None
Stop bit 1
Command Block
(see “OEM Protocol Command Block Characters”)
1 STX (^B or 02h)
2 Pump address
3 Sequence number
3+n Data block (length n)
4+n ETX (^C or 03h)
5+n Checksum
Answer Block
(see “OEM Protocol Answer Block Characters”)
1 STX (^B or 02h)
2 Master address (0 or 30h)
3 Status code
3+n Data block (length n)
4+n ETX (^C or 03h)
5+n Checksum
OEM P
ROTOCOL
C
OMMAND
B
LOCK
C
HARACTERS
The command block characters in the OEM communication protocol are described
below. All characters outside the command block are ignored.
When developing a parsing algorithm, the programmer should key on the STX as the
beginning of the answer block and the checksum (character after the ETX) as the end of
the answer block.
STX (^B or 02h)
The STX character indicates the beginning of a command.