c - how to implement Modbus RTU Master in Digi Module Connect me 9210 -


i trying implement modbus rtu master in digi module connect me 9210 device. purpose using libmodbus library.

what device name have give in netos connect local computer.?

now using 

ctx = modbus_new_rtu("com3", 19200, 'n', 8, 1); modbus_set_slave(ctx, server_id);  /* tcp */ //  ctx = modbus_new_tcp("10.0.0.66", 502);  modbus_set_debug(ctx, true);  if (modbus_connect(ctx) == -1) {     fprintf(stderr, "connection failed: %s\n",                 modbus_strerror(errno));     modbus_free(ctx);     return -1; }

but keep saying connection failed. have tried "/dev/usb0" , "/dev/ttys0". have modbus slave in local computer test module client.

i have fixed errors . there api issue in digi module while opening default port "/com/0".

also had change libmodbus library little bit work digi because using flags not supported device.


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