DIGITAL TRANSDUCER TESTER & PC-INTERFACE (AVA-03)
14-FEB-2022
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© Avanti Elektronik Limited - (44) 01224-583132 - www.avanti.clara.net - [email protected] dqdtst_32.docx
1. GENERAL
The Avanti I²C Transducer Tester and PC-Interface (AVA-03) is a standalone device for
accessing pressure/temperature transducers, which are equipped with a two-wire serial I²C
interface. It was designed to be compatible with Quartzdyne's range of digital quartz
pressure transducers, including their V4.02 enhancements (checksum etc). Up to 4
transducers can be connected simultaneously and their readings are displayed on a backlit
LCD. There is also an RS232 port provided, which allows to access readings and
calibration coefficients from a PC.
2. HARDWARE DESCRIPTION
The AVA-03 I²C Transducer Tester is housed in an aluminium enclosure measuring 168 x
103 x 56mm.
Transducer Socket Pinout
Pin-1
A1
Pin-2
SCL
Pin-3
GND
Pin-4
SDA
Pin-5
+5V
Pin-6
A2
Pin-7/8/9
NC
RS-232 Socket Pinout
Pin-2
RX (of PC)
Pin-3
TX (of PC)
Pin-5
GND
Pin-
1/4/6/7/8/9
NC
There are four 9-way D-type sockets (A...D) for connecting up to four I²C transducers. The
connectors carry +5V, GND, SCL, SDA and two address lines A2 and A1. The address
lines are either open (1) or grounded (0) and are coded differently at each socket: The first
socket sets A2=0/A1=0, the second socket sets A2=0/A1=1, the third socket sets
A2=1/A1=0 and the fourth socket sets A2=1/A1=1. This means that different I²C addresses
are allocated automatically for each socket, provided the address pins are wired through to
the transducers, see the examples shown in fig. 1 and fig. 2 below.
Figure 1: 6-wire connection, I²C address coded by the AVA-03 socket.
