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TECHNICAL INFORMATION
56
87-900-855-01 (B)
OPTIONAL SERIAL PORT
Serial Port Installati
on
An optional RS 232/422/485 kit is available for both
models. To install it, proceed as follows:
•
Switch off the power.
•
Unscrew the cover screws and remove the cover.
•
Unscrew
screw
A
and remove board
B
.
•
Attach the interface board connector to connector
P6 on the board
B
and then secure it in place using
screw
C
(3x6), which is not provided.
•
Reinstall board
B
and lock it to the controller
through the screw.
•
Insert the flat cable through the rear panel and plug
it into the socket
P1
located on the Interface board.
•
Restore the main board into its original position.
•
Install and tighten the connector screws and turrets.
•
Replace
the
cover.
Serial port connector installation
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 compliance with FCC
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
Transmission Channel Characteristics
levels: RS232/RS422
baud rate:
9600/4800/2400/1200/600
programmable
character length: 8 bits
parity: none
stop bit:
1 bit
protocoll:
master (PC) / slave (converter)
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> / <ADR> + <WINDOW> + <COMMAND> +
<DATA> + <ETX> + <CRC>
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