ReadEncoder for SRT

Reading encoder module for SRT: The Small Radio Telescope.

Software prerequisites

• git (for installation)
• cmake (for installation)
• Doxygen (for documentation, optional)
• modbus library
• SRT software

Installation:

Example installation commands:

mkdir build/
cd build/
cmake -DCMAKE_INSTALL_PREFIX="/opt/ReadEncoder/" -DCMAKE_BUILD_TYPE="Release" -DBUILD_DOC=OFF ../
make
make install

Run:

E.g.:

./ReadEncoder -s 1 -l 2 -n "ttyUSB0" -b 19200 -p 'E' -d 8 -t 1 -a 127 -e 0 -u 40000 -o 1 -r 0 -i 1 -c 1 -g 1

or the same in a longer version:

./ReadEncoder --start 1 \
--length 2 \
--deviceName "ttUSB0" \
--baud 19200 \
--parity 'E' \
--data_bit 8 \
--stop_bit 1 \
--slave_ad 127 \
--timeout_sec 0 \
--timeout_usec 40000 \
--loops 1 \
--repTime 0 \
--setTerm false \
--inPlace false \
--recovery true \
--debug true

If you will get an error message like:

error while loading shared libraries: libmodbus.so.5: cannot open shared object file: No such file or directory

then you need to add the libmodbus library folder to the LD_LIBRARY_PATH, e.g.:

echo 'export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/local/lib/' >> ~/.bashrc

Command line options:

Long command	Short command	Argument	Description
help	h	no
start	s	required	where to start reading (w/o offset)
length	l	required	how many registers to read
deviceName	n	required	e.g. "/dev/ttyUSB0" or shorter "ttyUSB0"
baud	b	required	[bps]
parity	p	required	'N', 'E' or 'O'
data_bit	d	required	number of bits of data, the allowed values are 5, 6, 7 and 8
stop_bit	t	required	bits of stop, the allowed values are 1 and 2
slave_ad	a	required	slave address
timeout_sec	e	required	timeout to set in [sec]...
timeout_usec	u	required	...and the [μsec] part. At least 13000, better 20000 (20ms) or 40000
loops	o	required	how many loops of reading. 0 = Inf
repTime	r	required	time between loops [msec]
setTerm	m	required	set termination register. False / 0 or off / 1 or on. Def = false
inPlace	i	required	in inifinite loop mode print registers in place or scroll the screen. Def = false
recovery	c	required	error recovery mode. Default = false
debug	g	required	debug mode. Default = false