ATI Technologies SmartTachSmartTach, User Manual

Page: 19 / 110

INSTALLATION
SmartTach Operating Manual Page 2-5
Analog Output Connection
The SmartTach precision analog output can be used to send real-time
speed information to a test cell computer, data acquisition system, strip-
chart recorder, etc. This output voltage is generated by a precision 12-bit
digital-to-analog converter (output accuracy is ±0.005 volts). The update
rate and low-pass filtering of this output are programmable using the
configuration parameters.
The maximum output voltage range is 0 to +10 volts. Maximum current
draw from the output should be limited to 10 milliamperes. The exact
scaling, offset, and output voltage range limits are programmable
through the configuration parameters. This allows the analog output to be
tailored to the requirements of the device receiving the signal.
A common use for the analog output is for data acquisition or display
measurements at a remote location. This can be easily done by using a
digital voltmeter for the remote display.
COM Port Connection
The SmartTach contains an RS-232 Serial Communications Port. This port
may be used by an external computer system to extract information from
the SmartTach and perform a remote configuration of the unit.
The RS-232 port connection is an industry-standard female 9-pin D-SUB
connector. Cables for connecting this port to a personal computer are
generally available from most computer/electronic component vendors,
or directly from Accurate Technologies Inc. The baud rate of the port is
programmable using the configuration parameters. Optional hardware
handshaking (DTR/DSR) can also be enabled.
Communication protocol information is available from Accurate
Technologies Inc. for customers wishing to write their own software to
communicate with the SmartTach. Please contact us for additional
information.
COM Port Pin Description
1 - DCD Output (Data Carrier Detect)
2 - TXD Output (Transmit Data)
3 - RXD Input (Receive Data)
4 - DTR Input (Data Terminal Ready)
5 - GND (Signal common)
6 - DSR Output (Data Set Ready)
7 - RTS Input (Request to Send)
8 - CTS Output (Clear to Send)