(Correct me if its a common known issue or if I made some stupid mistake.)
Today I get my new WRT3200ACM and start to play around. Everything is fine until I try the USB-to-TTL thing:
I picked a TTL-USB cable which has been working perfectly with my old router (TP-Link wr1041n). I connected the cable with the router & PC correctly. However, when I turn on the power, 6 of the LEDs (the 2 for wifi & the 4 for LAN) blinked once and then all LEDs are off forever. The boot process looks like being "blocked" by something and nothing is transmitted via the serial port.
Then I saw #12 of the thread "Did I just brick my router? Linksys WRT1900AC" in this forum (I don't have the permission to put a link here, sorry) and realized that I'm facing exactly the same issue: If PIN2 (TX on the router) is physically connected to the USB-TTL cable before the power is on, the boot will be blocked. But if I keep that pin physically disconnected, turn on the power first, and then immediately connect that pin, I'll be able to get those regular information (uboot & etc) from the serial port.
The post above is a WRT1900 v2 and my unit is WRT3200ACM. At first I thought this to be expected for WRT series routers but a youtube video connecting a WRT1200 using TTL-USB proved that I was wrong.
The cable I'm using is "silicon labs cp210x usb to uart bridge". Not sure if that's the problem of the cable itself. Anyway, this seems weird. Has anyone seen this before?
(Last edited by swgr on 19 Feb 2017, 13:36)