serial-communication

I am communicating with a device via serial via the SerialPort class of .NET and based on third-party device specification requirements I need to calculate a "block check character". The only information I am told is that it is an exclusive OR operation (XOR) and it must be performed over all characters. So if I have the string "Bob,001" how would one calculate the BCC? Most likely is character based XOR. You'll need to get samples of them to verify but most checksums usually end up at 0. So, for an XOR checksum, you would have the packet: Bob,001X where X is the checksum and, when you XOR all

I am using serial programming for get connected serial cable to my iPhone my code is as under #include <stdio.h> /* Standard input/output definitions */ #include <string.h> /* String function definitions */ #include <unistd.h> /* UNIX standard function definitions */ #include <fcntl.h> /* File control definitions */ #include <errno.h> /* Error number definitions */ #include <termios.h> /* POSIX terminal control definitions */ static struct termios gOriginalTTYAttrs; static int OpenSerialPort() { int fileDescriptor = -1; int handshake; struct termios options; // Open the serial port read/write,

So I'm working my way through kernel driver programming, and currently I'm trying to build a simple data transfer between application and kernel driver. I am using simple character device as a link between these two, and I have succeeded to transfer data to driver, but I can't get meaningful data back to user space. Kernel driver looks like this: #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> /* printk() */ #include <linux/errno.h> /* error codes */ #include <linux/types.h> /* size_t */ #include <linux/proc_fs.h> #include <asm/uaccess.h> /* copy_from/to_user */

am new to Modbus and developing an application using Modbus RTU. I would like to know how to find out the RTU message frame separation time. In the Modbus RTU specification, It mentions 3.5 chars time, but there is no more data about how i can decide this intervals. and wat are the steps to calculate the separation time? Take a look at page 13 of the Modbus Serial Line Protocol and Implementation Guide V1.02 At the bottom you will find a remark explaining the inter-character time-out (t1.5) and inter-frame delay (t3.5) values. For baud rates over 19200 values are fixed. For slower baud rates

I am communicating with a servo via RS232 serial. The built-in functions that came with my servo are too slow (25 ms for a simple 54 byte message on a 57,600 baud port), so I am trying to write my own communication functions, however the built-in functions are not documented. I have used a port monitor to determine what information is being sent to the servo and I need help deciphering the results. I used the built-in functions to command the servo to "goto" incrementally increasing steps (1, 2, 3, etc.). This resulted 5 packets being sent to the servo for each "goto" command. The first 4

I am trying to use GPRS functionality of the GSM/GPRS modem for sending data to the remote server but i am unable to do so.I had posted a question on Arduino Forum but didn't get any reply. Here is the link for the question . Well my Main concern is i) I am using a GPRS/GSM Modem and i am not sure about the Power requirements of the Modem.At present i am using a 9V and 1 amp supply but the network LED on the modem is dignifying that Modem is not getting the network. So can this be because of the insufficient supply to the modem? I very much doubt it's a power thing. Although I have limited