Rs 232-422 Communication Descriptions; Trasmission Channel Characteristics; Rs 485 Communication Description; Transmission Channel Characteristics - Varian Turbo-V 2000HT Instruction Manual

RS 232-422 Communication Descriptions

Communication RS 232 serial port connections
Communication RS 422 serial port connections

Transmission Channel Characteristics

levels: RS 232/RS 422
baud rate: 9600/4800/2400/1200/600
programmable
character length: 8 bits
parity: none
stop bit: 1 bit
protocoll: master (PC) / slave (converter)
In this case the value to be assigned to the ADDRESS
field must be 80 hex (for RS 232 and 422 only).

RS 485 Communication Description

Transmission Channel Characteristics
levels:
GND
B(-) RXD
baud rate:
A(+) RXD
B(-) TXD
character length:
A(+) TXD
parity:
B(-) RXD
stop bit:
A(+) RXD
protocoll:
B(-) TXD
max. devices:
A(+) TXD

Message Structure

(request and answer have the same format)
The master system (PC) starts every session sending
the following message to the slave units connected:
<STX> / <ADDR> + <WINDOW> + <COMMAND> +
<DATA> + <ETX> + <CRC>
where:
<STX> =
<ADDR> =
<ADDR> =
<WINDOWS>=
<COMMAND>=
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TECHNICAL INFORMATION
Communication RS 485 serial port connections
RS 485
9600/4800/2400/1200/600
programmable
8 bits
none
1 bit
master (PC) / slave (converter)
32
0x02
0x80 (for RS 232 and
RS 422 only)
0x80 + device number (0...31)
0xFF: brodcasting command
(recognized by all the devices, it
doesn't implicate any answer)
(for RS 485 only)
' 000 '...' 999' window number
the meaning of the window
depends to the device type
0x30: window value reading
0x31: window writing
(-)
( + )
(-)
( + )
87-900-913-01 (N)