I am using SIM7600 module with Beaglebone board connected thru UART2. It works well with ppp on /dev/ttyS2.
Since the application wants the GPS info simultaneously, trying to use CMUX with the n_gsm driver as given here
https://github.com/Rtone/cmux
The modem responds with OK for AT+CMUX=0,0,5,127,0,0,200.
The tty devices for the virtual ports 1 to 4 are created in the linux - /dev/ttyGSM[1-4].
But no serial port utilities work.
Anyone has any experience in this.
Related
I Have a RF module that communicate using serial port using RS232. It works in a normal computer.
I noticed that beaglebone has a serial debug slot and I tried to connect my device to it but, I can't send or receive messages using the serial debug slot.
If I connect the beaglebone to usb converting to RS232, I'll be able to communicate with my RF module. And I tested to connect by SSH using the serial slot and worked.
But I would like to use USB for another purpose. Is there a serial pins to be compatible with RS232?
I would like to develop my own modem for a custom communication network that will be detectable on the serial port by PC automatically. What I'm uncertain about is the protocol part of the AT commands and how to make it work seamlessly so that computer will detect the modem automatically.
I plan to use ftdi UART to USB converter to interface my microcontroller with the PC using standard serial interface. The PC will then use AT commands to communicate with the microcontroller that will in turn connect to another microcontroller over radio tranceiver and establish a two way serial connection over radio. The idea is that the PC on the other end will run PPPD and listen on it's own modem connection for incoming call and then bridge the connection with it's other internet interface that is connected to internet. The first computer will get it's own IP address using PPPD and will be connected to internet over this custom microcontroller based modem.
But how do I implement the communication protocol between my controller and PC? What commands do I absolutely need to implement? How do I make sure that the computer recognises my controller which is connected over ftdi usb to serial adapter as a functional modem?
Where can I find a speciffication of the minimum command set that is required of a modem?
In practice linux usually discovers a 3G modem automatically for example. Does that have to do with the actual USB identifier of the modem? Is it possible to have linux automatically discover an ordinary serial port modem? I'm thinking that the modem will be sending an AT idle ping repeatedly when it's plugged in so that linux should be able to detect it.
I've been trying to test a FT201XQ USB-I2C breakout board: UMFT201XB-01, so I can connect it to a master device such as an Arduino and sniff what that device is sending through I2C.
To see the output of the slave device I have successfully configured a Virtual COM PORT by installing the D2XX drivers provided by ftdchip.com. I can open the serial port through puTTY and everything seems fine in that regard.
Then, i've loaded the "master_writer" example on my Arduino, which sends 1 byte at a time to an address (0x22 is specified in the UM201XB-01 datasheet as the default address).
Nothing seems to happen in the COM port that i've earlier opened. Do I need to configure/program the FTDI device in some way? In that case, how can I do it, in a general way?
UMFT201XB-01 board http://www.ftdichip.com/Support/Documents/DataSheets/Modules/DS_UMFT201_220_230XB.pdf
Thank you in advance, and sorry if this is a "noob" question : P
Background
I am trying to connect to a serial GSM - modem of Wavecom type.
I was able to communicate with the modem using the guide
http://www.easysw.com/~mike/serial/serial.html
on my Ubuntu machine.
but when I tried to connect it through a device with serial port and running on Linux kernel Linux 2.6.14.7-tiny1-WR1.3al_small I get junk data returned. I have tried all of the baud values to connect to the modem. It connected on 115200 baud value when it was working, but the same value does not work from this Kernel. Its a ARM target machine. note : I cross compiled the code for ARM
Question
Do I need a driver for a modem to just be connected through a serial terminal Program ?
Please make sure that the RS232/TTL converter of your ARM board is working correctly. for example you can connect it to your Ubuntu machine at first and transmit something with a terminal program.
question : 1 ) Do i need a driver for Modem to just be connected through a Serial Terminal Program ?
No.You can connect to your GSM modem simply by having a serial port and a terminal program.
So, this topic is very similar to this Cisco Switch/Router programming using Arduino?.
I have an Arduino ATmega2560 and Ethernet Shield plus a Cisco 1751 router. I want to configure the router via the console or AUX port using Arduino.
Fast search gave the following results: you could connect to the router using RJ45 to Serial or RJ45 to RJ45 connectors; the protocol is very similar to Telnet (actually works like serial port with text-based commands).
So the main question is - am I able to control the router via a console or AUX port using Ethernet Shield (and an Ethernet library) or do I have to use a serial port connection using something like RS-232?
Update: I've noticed one thing - the DB9 port is just an option for easy communicating with a PC so it seems that my idea is not so bad:) See Cabling and Adapter Setups that Work.
As you have pointed out the console and aux ports on Cisco devices are serial ports not network ports so you need to connect to them using RS232, this is an entirely different type of interface from Ethernet.