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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 Navigation 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 Navi-
gator software.
Communication Format
•
8 data bit
•
no parity
•
1 stop bit
•
baud rate: 600/1200/2400/4800/9600 pro-
grammable
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
32
TECHNICAL INFORMATION
NOTE
87-900-973-01
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