Inhaltsverzeichnis
Werbung
Serial Communication Port J13 and J14
Communication serial port connections and mini- mum
connection configuration are shown in the following
figures. The communication port mating connector is
supplied with the RS 232 PCB (AMP/Cannon or
equivalent 9-pin "D" type male connector). The external
cable (not supplied) between the host computer and
the controller does not require crossed wires so that
signals are connected correctly.
For example, the Transmit data signal from controller
(pin 2) must be connected to the host computer's
Receive data line (pin 2) and vice versa. Consult the
host computer's instruction manual for its serial port
connections.
NOTE
Varian
cannot
guarantee
regulations for radiated emissions unless all external
wiring is shielded, with the shield being terminated to
the metal shroud on the O-subconnector. The cable
should be secured to the connector with screws.
RS 232-422 Communication Descriptions
Communication RS 232 serial port connections
Communication RS 422 serial port connections
compliance
with
FCC
Transmission Channel Characteristics
levels:
baud rate:
character length:
parity:
stop bit:
protocoll:
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
Communication RS 485 serial port connections
Transmission Channel Characteristics
levels:
baud rate:
character length:
parity:
stop bit:
protocoll:
max. devices:
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>
76
TECHNICAL INFORMATION
RS232/RS422
9600/4800/2400/1200/600
programmable
8 bits
none
1 bit
master (PC) / slave (converter)
RS 485
9600/4800/2400/1200/600
programmable
8 bits
none
1 bit
master (PC) / slave (converter)
32
87-900-902-01 (L)
Werbung
Inhaltsverzeichnis
