How To Connect The Outputs Of The Controller; P2 - Serial; Rs 232/Rs 485 Communication Description; Communication Format - Agilent Technologies Varian TV 1001SEM Bedienungshandbuch

How to connect the outputs of the controller

The following figure shows a typical logic output
connection (relay coil) but any other device may be
connected e.g. a LED, a computer, etc., and the
related simplified circuit of the controller. The fig-
ure example refers to the programmable set point
signal on pins 11 and 9.
Typical output connection

P2 - Serial

This is a 9 pin D-type serial input/output connector
to control via an RS 232 or RS 485 connection the
TV 1001.
PIN N.
1 SPARE
2 TX (RS232)
3 RX (RS232)
4 SPARE
5 GND
6 A + (RS485)
7 SPARE
8 B – (RS485)
9 RESERVED
Note that the vent valve can also be controlled by
means of the serial connection.
A serial communication kit with a serial cable and
the T-Plus software is available (optional).
SIGNAL NAME
RS 232/RS 485 COMMUNICATION
DESCRIPTION
Both the RS 232 and the RS 485 interfaces are
available on the connector P2.
The communication protocol is the same (see the
structure below), but only the RS 485 manages the
address field. Therefore to enable the RS 485 is
necessary to select the type of communication as
well as the device address by means of the T-Plus
software.

Communication Format

8 data bit
no parity
1 stop bit
baud rate: 600/1200/2400/4800/9600 programma-
ble

Communication Protocol

The communication protocol is a MASTER/SLAVE
type where:
Host = MASTER
Controller = SLAVE
The communication is performed in the following
way:
the host (MASTER) send a MESSAGE + CRC to
the controller (SLAVE);
the controller answer with an ANSWER + CRC to
the host.
The MESSAGE is a string with the following format:
<STX>+<ADDR>+<WIN>+<COM>+<DATA>+<ETX>+<CRC>
where:
When a data is indicated between two quotes ('...')
it means that the indicated data is the correspond-
ing ASCII character.
−
<STX> (Start of transmission) = 0x02
−
<ADDR> (Unit address) = 0x80 (for RS 232)
<ADDR> (Unit address) = 0x80 + device num-
ber (0 to 31) (for RS 485)
−
<WIN> (Window) = a string of 3 numeric char-
acter indicating the window number (from '000'
to '999'); for the meaning of each window see
the relevant paragraph.
−
<COM> (Command) = 0x30 to read the win-
dow, 0x31 to write into the window
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TECHNICAL INFORMATION
NOTE
87-900-973-01(E)