TECHNICAL INFORMATION
76
87-900-988-01 (B)
OPTIONAL SERIAL PORT
NOTE
The Controller can be read when set in the
Front/Remote mode, (read window only enabled), while
it can be written to and read when set in the Serial
mode (write window enabled).
Serial Port Installation
An optional RS 485 kit is available for both models.
To install it, proceed as follows:
•
Switch off the power and disconnect the power
cord.
•
Unscrew the cover screws and remove the cover.
•
On rear panel, remove the connector plate, and
then secure connectors J13 to the frame using the
turrets provided.
•
On rear panel, remove the fixing turrets of
connectors
B
and
C
and then remove the controller.
•
Attach the interface board connector to connector
P6 on the controller and then secure it in place
using screw
A
(3x6), which is not provided.
•
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.
B
C
A
J13
P6
Serial port connector installation
Serial Communication Port J13
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 Communication Descriptions
Communication RS 232 serial port connections
Transmission Channel Characteristics
levels: RS
232
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).
RS 485 Communication Description
Communication RS 485 serial port connections
Transmission Channel Characteristics
levels: RS
485
baud rate:
9600/4800/2400/1200/600
programmable
character length: 8 bits
parity: none
stop bit:
1 bit
protocoll:
master (PC) / slave (converter)
max. devices:
32
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>