We are trying to read a device that has a DSUB9 connector from the IndioD21G microUSB using a USB-to-DSUB9 converter. However, it appears that the microUSB on the Industruino does not provide the 5V line necessary to power the USB-to_DSUB9 converter. Is it expected that the microUSB does not provide the 5V power?
Hi, i've checked and indeed i also get 3V3 on the positive line of the microUSB slot of the INDIO D21G. I think think this is not totally unexpected as USB is a host-client connection, and the microUSB is at the client side (type B) which does not need to provide power (unless it is of OTG type).
As alternative solutions, you could have a look at an RS485-RS232 converter, or a TTL Serial-RS232 converter on one of the 2 hardware serial ports on the IDC connector. Our GSM/GPRS module has an RS232 port.
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