<pre>readCoils: START
Connected
Packet: 45c80000000600013000000c
Send
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
Wait data ... 
</pre>Exception: Watchdog time expired [ 5 sec]!!! Connection to 192.192.15.51 is not established. in /var/www/html/laravel_test/vendor/adduc/phpmodbus/Phpmodbus/ModbusMaster.php:166
Stack trace:
#0 /var/www/html/laravel_test/vendor/adduc/phpmodbus/Phpmodbus/ModbusMaster.php(234): ModbusMaster->rec()
#1 /var/www/html/laravel_test/vendor/adduc/phpmodbus/examples/example_fc1.php(10): ModbusMaster->readCoils(0, 12288, 12)
#2 {main}