Communication Protocol - Agilent Technologies TwisTorr 84 FS PCB 24 Manual De Instrucciones

Communication Protocol

The communication protocol is master-slave type, where:


To write data through the serial interface, the controller must be set to
NOTE
"REMOTE OFF" operation, otherwise only read data command will be available.
The exchanged frame format is composed of ASCII values. The frame
composition is:
slave
address
where:


1
0=
parameter
reading
1 =
parameter
writing
TwisTorr 84 FS PCB 24 Vdc Controller User Manual / 87-901-039-01 (B)
Host = Master
Controller = slave
Parameter
number
Slave Address: made of three characters containing the
controller address requested by the master. In RS-232 version the
address is "001";
Parameter Number: made of five characters, it points out to the
controller about which parameter the master wants to operate,
and about the kind of operation (read/write). It consists of:
2 3
always 0 000 to 299 = commands
300 to 699 = status
700 to 999 = parameter
Technical Information
Data Exchange Protocols
data data
field
length
4
17
check CR
sum
5
185/210