Warning: Unexpected Warning: A timeout occurred before the Terminator was reached.

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Dogukan Kucukler 2018-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/408086-warning-unexpected-warning-a-timeout-occurred-before-the-terminator-was-reached

Hello everyone,

I know this is stupid question but I am really new to these things.I would like to build a communication between stepping motor and computer by MATLAB(using MODBUS(RS485)) and according to motor user manual I have to send some quaries to the motor and after that ı have to see that the motor will operate.Here is my code when I run it.It comes me like Warning: Unexpected Warning: A timeout occurred before the Terminator was reached. Why am I getting this warning and why cant the motor operate ? Thank you

clear all close all instrreset clc; disp('BEGIN PROGRAM'); %% Instrument Connection

% Find a serial port object. obj1 = instrfind('Type', 'serial', 'Port', 'COM6', 'Tag', '','Terminator','CR');

% Create the serial port object if it does not exist % otherwise use the object that was found. if isempty(obj1) obj1 = serial('COM6'); else fclose(obj1); obj1 = obj1(1); end

% Configure instrument object, obj1. set(obj1, 'BaudRate', 115200); set(obj1, 'Parity', 'even'); set(obj1, 'Timeout', 10.0);

%% Disconnect and Clean Up

% Disconnect from instrument object, obj1. fclose(obj1);

%% Instrument Connection

% Connect to instrument object, obj1. fopen(obj1);

%% Instrument Configuration and Control

% Communicating with instrument object, obj1. fwrite(obj1, '1 16 24 0 0 2 4 0 0 0 2 216 110'); fgetl(obj1); fwrite(obj1, '1 16 24 2 0 2 4 0 0 33 52 193 241'); fgetl(obj1); fwrite(obj1, '1 16 24 4 0 2 4 0 0 7 208 91 240'); fgetl(obj1); fwrite(obj1, '1 16 24 6 0 2 4 0 0 5 220 219 76'); fgetl(obj1); fwrite(obj1, '1 16 24 8 0 2 4 0 0 5 220 90 192'); fgetl(obj1); fwrite(obj1, '1 16 0 124 0 2 4 0 0 0 8 245 24'); fgetl(obj1); fwrite(obj1, '1 16 0 124 0 2 4 0 0 0 0 244 222'); fgetl(obj1);

fclose(obj1); delete(obj1); clear obj1 disp('STOP')

BEGIN PROGRAM Warning: Unexpected Warning: A timeout occurred before the Terminator was reached. Warning: Unexpected Warning: A timeout occurred before the Terminator was reached. Warning: Unexpected Warning: A timeout occurred before the Terminator was reached. Warning: Unexpected Warning: A timeout occurred before the Terminator was reached. Warning: Unexpected Warning: A timeout occurred before the Terminator was reached. Warning: Unexpected Warning: A timeout occurred before the Terminator was reached. Warning: Unexpected Warning: A timeout occurred before the Terminator was reached. STOP >