we have a problem usign ppp and HE910 connected using USIF0.
Serial port USIF0 is connected to a uart using four signals: TX,RX,RTS and CTS.
The module is also connected to USB for testing.
Using minicom I get on /dev/ttyACM0:
atzOKAT+CGDCONT=1,”IP”,”MYOP.TIM.IT”OKatd*99***1#CONNECT~}#þ!}!}!} }8}”}&} } } } }#}$þ#}%}&7}8þ}’}”}(}”L~~}#þ!}!}!} }8}”}&} } } } }#
And ppp/chat works perfectly usign script.I get my IP.
If i try the same on /dev/ttyS3i get:
atzOKAT+CGDCONT=1,”IP”,”MYOP.TIM.IT”OKatd*99***1#NO CARRIERThe NO CARRIER signals is generated after 6-7 seconds
I tried playing with flow control both AT&K0 and AT&K3 with no luck, still no carrier.
Am I missing something? Do I need some particular configuration on USIF0?
Thanks for your support.
whichis your firmware version?
which is the options file used?
Hi,AT+CGMR returns 12.00.003AT+CGMM returns HE910
Serial port configuration:stty -F /dev/ttyS3 returns
speed 115200 baud;
min = 1; time = 5;ignbrk -brkint -icrnl -imaxbel-opost -onlcr-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
Usb-Serial port configurationstty -F /dev/ttyACM0 returns
speed 115200 baud;min = 1; time = 5;ignbrk -brkint -icrnl -imaxbel-opost -onlcr-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
Using minicom under angstrom linux which is like hyperterminal for windowsWith both I configure the modemAT+CPIN=*****AT+COPS=1,2,22201,0AT+CGDCONT=1,”IP”,”******.TIM.IT”
Then test field strenght:AT+CSQ returns+CSQ: 11,00
Then I try to connect using:ATD*99***1#on /dev/ttyACM0 i get a CONNECT answer andon /dev/ttyS3 it lags 6-7 seconds then I get a NO CARRIER
please check the RTS status of the serial port.
If the RTS is OFF (high on module side) the PPP cannot start because blocked by the hw flow control.
RTS should be ON (0V) when ATD*99***1# is issued.
thanks for your support. After your post we had a bit more time to investigate the serial port configuration on the board files and the kernel. We found a problem in the initialization of the periferal. Now the modem connects also using the serial port.
Thanks for your help.
Hit enter to search or ESC to close
Knowledge Base & Download Zone