CAVRO XP 3000, Руководство оператора, Страница: 44 / 134

Software Communication
3-8
Data Terminal (DT) Protocol
The DT protocol can be used easily from any terminal or terminal emulator capable of
generating ASCII characters at 9600 baud, 8 bits, and no parity.
Table 3-4. DT Protocol (JP1-2, Jumper OUT)
Character Format
Parameter Setting
Baud rate 9600 or 38400 (set using JP1-4)
Data bits 8
Parity None
Stop bit 1
Command Block
(see “DT Protocol Command Block Characters”)
1 Start command (ASCII “/” or 2Fh)
2 Pump address
2+n Data block (length n)
3+n Carriage Return ([CR] or 0Dh)
Answer Block
(see “DT Protocol Answer Block Characters”)
1 Start answer (ASCII “/” or 2Fh)
2 Master address (ASCII “0” or 30h)
3 Status character
3+n Data block (if applicable)
4+n ETX (03h)
5+n Carriage Return (0Dh)
6+n Line feed (0Ah)
DT P
ROTOCOL
C
OMMAND
B
LOCK
C
HARACTERS
The command block characters in the DT communication protocol are described below.
Start Block
The start character indicates the beginning of a message block.
Pump Address
The pump address is an ASCII character specific to each pump.
Data Block (length n)
The data block consists of the ASCII data or commands sent to the pump or host.
End Block
The end character indicates the end of a message block.