Query: modbus_new_rtu
OS: debian
Section: 3
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
MODBUS_NEW_RTU(3) Libmodbus Manual MODBUS_NEW_RTU(3)NAMEmodbus_new_rtu - create a libmodbus context for RTUSYNOPSISmodbus_t *modbus_new_rtu(const char *device, int baud, char parity, int data_bit, int stop_bit);DESCRIPTIONThe modbus_new_rtu() function shall allocate and initialize a modbus_t structure to communicate in RTU mode on a serial line. The device argument specifies the name of the serial port handled by the OS, eg. /dev/ttyS0 or /dev/ttyUSB0. On Windows, it's necessary to prepend COM name with \. for COM number greater than 9, eg. \\.\COM10. See http://msdn.microsoft.com/en-us/library/aa365247(v=vs.85).aspx for details The baud argument specifies the baud rate of the communication, eg. 9600, 19200, 57600, 115200, etc. The parity argument can have one of the following values o N for none o E for even o O for odd The data_bits argument specifies the number of bits of data, the allowed values are 5, 6, 7 and 8. The stop_bits argument specifies the bits of stop, the allowed values are 1 and 2.RETURN VALUEThe modbus_new_rtu() function shall return a pointer to a modbus_t structure if successful. Otherwise it shall return NULL and set errno to one of the values defined below.ERRORSEINVAL An invalid argument was given.EXAMPLEmodbus_t *ctx; ctx = modbus_new_rtu("/dev/ttyUSB0", 115200, 'N', 8, 1); if (ctx == NULL) { fprintf(stderr, "Unable to create the libmodbus context "); return -1; }SEE ALSOmodbus_new_tcp(3) modbus_free(3)AUTHORSThe libmodbus documentation was written by Stephane Raimbault <stephane.raimbault@gmail.com[1]>NOTES1. stephane.raimbault@gmail.com mailto:stephane.raimbault@gmail.com libmodbus 3.0.3 05/26/2012 MODBUS_NEW_RTU(3)
Related Man Pages |
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modbus_new_rtu(3) - debian |
modbus_new_tcp_pi(3) - debian |
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