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i would like to send a stream of bytes to a serial port using the command line. is this possible? my serial port is at /dev/cu.usbserial-A700dYoR on my Mac. for example, if i wanted to send the integer 50 or the string "data" to that serial port, how can i do that?

my knowledge of UNIX is very limited.

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1 Answer 1

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#!/bin/bash

# Port setting
stty -F /dev/cu.usbserial-A700dYoR raw speed 9600

echo 'Hello' > /dev/cu.usbserial-A700dYoR

or something like that if I remember correctly... Been a few years. You will probably have to be sudo for it to work...

This is sending text... not binary.. to send the number 50 as text

echo '50' > /dev/cu.usbserial-A700dYoR

to send it as a binary integer would be more difficult.

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7 Comments

echo '2' > /dev/cu.usbserial-A700dYoR will send 50 as a single byte. If you really need to send an "integer", you have to discover what is an "integer" for the receiver (e.g. big or little endian, 7 or 8 byte stream, encoding).
basically, i'm trying to send something like writeByte(50), or any integer ranging from 0-255, to the serial port. can i specify the endian on the command line?
@TDI1978: If you're sending bytes individually, you may not need to worry about byte order. To send a decimal 50 byte in Bash: printf '%c' $'\x32' > /dev/cu.usbserial-A700dYoR
...or printf '%b' '\x32' > /dev/cu.usbserial-A700dYoR
what's the translation? i will be sending bytes whos value ranges from 0 to 255, so if 50 is equivalent to x32, how do i get that equivalency?
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