User Manual

I
2
CDriver User Guide 22
7 Technical notes
7.1 Port names
The serial port that I
2
CDriver appears at depends on your operating system.
On Windows, it appears as COM1, COM2, COM3 etc. You can use the De-
vice Manager or the MODE command to display the available ports. This article
describes how to set a device to a fixed port.
On Linux, it appears as /dev/ttyUSB0, 1, 2 etc. The actual number depends
on the order that devices were added. However it also appears as something
like:
/dev/serial/by-id/usb-FTDI_FT230X_Basic_UART_DO00QS8D-if00-port0
Where DO00QS8D is the serial code of the I
2
CDriver (which is printed on the
bottom of each I
2
CDriver). This is longer, of course, but always the same for a
given device.
Similarly on Mac OS, the I
2
CDriver appears as /dev/cu.usbserial-DO00QS8D.
7.2 Decreasing the USB latency timer
I
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CDriver performance can be increased by setting the USB latency timer to its
minimum value of 1 ms. This can increase the speed of two-way I
2
C traffic by
up to 10X.
On Linux do:
setserial /dev/ttyUSB0 low_latency
On Windows and Mac OS follow these instructions.
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