06-11-2007
Hi,
Maybe your device is blocking during sending output to first request.
I would try to use 'cat' to write and read in 2 different processes.
Run
cat > /dev/cu.usbserial
in one terminal and
cat /dev/cu.usbserial
in another.
Regards
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LEARN ABOUT FREEBSD
uplcom
UPLCOM(4) BSD Kernel Interfaces Manual UPLCOM(4)
NAME
uplcom -- USB support for Prolific PL-2303/2303X/2303HX serial adapters driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device usb
device ucom
device uplcom
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
uplcom_load="YES"
DESCRIPTION
The uplcom driver provides support for various serial adapters based on the Prolific PL-2303, PL-2303X and PL-2303HX USB-to-RS232 Bridge
chips.
The device is accessed through the ucom(4) driver which makes it behave like a tty(4).
HARDWARE
The uplcom driver supports the following devices and adapters:
o ADLINK ND-6530 USB-Serial Adapter
o Alcatel One Touch 535/735 Phone
o Alcor AU9720 USB-RS232 Serial Adapter
o AlDiga AL-11U Modem
o Alltronix ACM003U00 Modem
o Anchor Serial adapter
o ATEN UC-232A
o BAFO BF-800 and BF-810
o Belkin F5U257
o BenQ S81 Phone
o Corega CG-USBRS232R Serial Adapter
o Cressi Edy (Seiko) Diving Computer
o ELECOM UC-SGT Serial Adapter
o HAL Corporation Crossam2+USB IR commander
o Hama USB RS-232 Serial Adapter
o Hamlet exagerate XURS232
o HP LD220 Point-Of-Sale (POS) Display
o IOGEAR UC-232A
o I/O DATA USB-RSAQ, USB-RSAQ2, USB-RSAQ3 and USB-RSAQ5
o iTegno WM1080A GSM/GFPRS Modem
o iTegno WM2080A CDMA Modem
o Leadtek 9531 GPS
o Micromax 610U Modem
o Microsoft Palm 700WX
o Mobile Action MA-620 Infrared Adapter
o Motorola Cables
o Nokia CA-42 Cable
o OTI DKU-5 cable
o Panasonic TY-TP50P6-S flat screen
o PLX CA-42 Phone Cable
o PLANEX USB-RS232 URS-03
o Prolific Generic USB-Serial Adapters
o Prolific Pharos USB-Serial Adapter
o RATOC REX-USB60
o Radio Shack USB Serial Cable
o Sagem USB-Serial Adapter
o Samsung I330 Phone Cradle
o Sandberg USB to Serial Link (model number 133-08)
o Sanwa KB-USB2 Multimeter cable
o Siemens/BenQ EF81, SX1, X65 and X75 Mobile Phones
o Sitecom USB-Serial Adapter
o SMART Technologies USB-Serial Adapter
o Sony QN3 Phone Cable
o Sony Ericsson Datapilot
o Sony Ericsson DCU-10 and DCU-11 (Susteen) USB Cables
o SOURCENEXT KeikaiDenwa 8 (with and without charger)
o Speed Dragon USB-Serial Cable
o Syntech CPT-8001C Barcode Scanner
o TDK UHA6400 and UPA9664 USB-PHS Adapters
o TRENDnet USB to Serial Converter (TU-S9)
o Tripp-Lite U209-000-R USB-Serial Adapter
o UIC HCR331 Magnetic Stripe Card Reader
o UIC MSR206 Magnetic Stripe Card Reader
o Willcom W-SIM DD PHS terminal.(WS002IN)
o YC-Cable USB-Serial Adapter
o Zeagle N2iTion3 Diving Computer
SEE ALSO
tty(4), ucom(4), usb(4)
HISTORY
The uplcom driver appeared in NetBSD 1.6. This manual page was adopted from NetBSD by Tom Rhodes <trhodes@FreeBSD.org> in April 2002.
BSD
July 25, 2012 BSD