>[ Please make sure to CC the linux-usb list as well. ] Sure Johan. I have visited several stores today that should have had either a null-modem or another type of USB to serial converter but unfortunately this was not the case. The store owners even thought that this should be something that they had available at all times and dove down into piles of cables but came up empty. The brand of this USB-Serial converter is sold by or as "Plexgear" or "Marquant". Absolutely no info on the adapter is provided in the package other then a mini-cd saying its a "prolific" product. I tried to send initialization code "117" followed by servo movement codes to it via gtkterm. The only time the adapter responded was at 115200 Baud. I need an adapter that can handle 2400 Baud to talk to the ft639/ede639 servo controller chip or possibly a pl2303 driver that is improved. I have looked at vscom, a very similar looking adapter on all counts except shape. This adapter uses a linux driver called "ftdi_sio" from info i have read on the net. What im really looking for here is an usb to serial adapter that works for 2400 Baud and not only 115200. I guess ill have to buy a new one from somewhere, but im missing the what and the where :) Sincerely, Magnus > [ Please make sure to CC the linux-usb list as well. ] > > On Tue, Feb 18, 2014 at 02:57:45AM +0100, Magnus wrote: > > After plugging in the plexgear adapter into my linux boxes: > > Fedora 18, Debian 3.11.0-15-generic #25-Ubuntu and weezy it doesnt > > send any commands to the servo controller chip on the other side > > of the converter. > > > > I can open the port /dev/ttyUSB0 and send to it with stty, but not > > a beep on the other side. I have also set the tty Baudrate manually to > > 2400 but this made no difference. My code does this as well including > > setting stopbit parity and so on. > > First verify that the converter works by connecting it to a serial port > on your PC and using a terminal program such as minicom at 115200 baud > (and the same port settings including flow control) on both ends. > > Also make sure you got the wiring right (e.g. use a null-modem cable). > > > Some data i get from Linux and Plexgear converter follows: > > > > $ lsmod | grep pl2303 > > pl2303 18527 0 > > usbserial 38603 1 pl2303 > > > > > > $ lsusb > > Bus 005 Device 007: ID 067b:2303 Prolific Technology, Inc. > > PL2303 Serial Port > > > > $ lsusb -v > > > > Bus 005 Device 007: ID 067b:2303 Prolific Technology, Inc. > > PL2303 Serial Port > > > > Couldn't open device, some information will be missing > > (My comment... hmm, but it can read from it ?).. > > > > Device Descriptor: > > bLength 18 > > bDescriptorType 1 > > bcdUSB 1.10 > > bDeviceClass 0 (Defined at Interface level) > > bDeviceSubClass 0 > > bDeviceProtocol 0 > > bMaxPacketSize0 64 > > idVendor 0x067b Prolific Technology, Inc. > > idProduct 0x2303 PL2303 Serial Port > > bcdDevice 3.00 > > iManufacturer 1 > > iProduct 2 > > iSerial 0 > > bNumConfigurations 1 > > Configuration Descriptor: > > bLength 9 > > bDescriptorType 2 > > wTotalLength 39 > > bNumInterfaces 1 > > bConfigurationValue 1 > > iConfiguration 0 > > bmAttributes 0x80 > > (Bus Powered) > > MaxPower 100mA > > Interface Descriptor: > > bLength 9 > > bDescriptorType 4 > > bInterfaceNumber 0 > > bAlternateSetting 0 > > bNumEndpoints 3 > > bInterfaceClass 255 Vendor Specific Class > > bInterfaceSubClass 0 > > bInterfaceProtocol 0 > > iInterface 0 > > Endpoint Descriptor: > > bLength 7 > > bDescriptorType 5 > > bEndpointAddress 0x81 EP 1 IN > > bmAttributes 3 > > Transfer Type Interrupt > > Synch Type None > > Usage Type Data > > wMaxPacketSize 0x000a 1x 10 bytes > > bInterval 1 > > Endpoint Descriptor: > > bLength 7 > > bDescriptorType 5 > > bEndpointAddress 0x02 EP 2 OUT > > bmAttributes 2 > > Transfer Type Bulk > > Synch Type None > > Usage Type Data > > wMaxPacketSize 0x0040 1x 64 bytes > > bInterval 0 > > Endpoint Descriptor: > > bLength 7 > > bDescriptorType 5 > > bEndpointAddress 0x83 EP 3 IN > > bmAttributes 2 > > Transfer Type Bulk > > Synch Type None > > Usage Type Data > > wMaxPacketSize 0x0040 1x 64 bytes > > bInterval 0 > > > > I can code some, but i dont know where to start so any > > help on this is highly appreciated. > > > > When i google to find info on adapters i read that > > "bMaxPacketSize0 64" indicates that its a counterfeit product > > but i paid 250 Swedish for it and that not very cheap for a > > univeristy student i think. > > This device is likely not a clone, but should be supported by the pl2303 > driver either way (at least at 115200 baud). > > Good luck, > Johan -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
