Possible Causes:
1 The card is invalid (no card issued or authorized);
The connection between the 2nd gate and the card reader is incorrect or not connected.
3 The card reader has been under computer control (the control switch has been shorted), parking lot monitoring has not been opened.
Second, the card close to the card reader, buzzer buzzing, Chinese display no response, in the software monitoring interface can not see the read card number (card reader and computer communication is abnormal).
Possible Causes:
1 The connection between the controller and the computer is incorrect;
2 The serial port set in the software does not match the actual serial port used.
Third, click on the "Open Gate" button in the monitoring interface, the gate will not open, but the manual button can be used to open the gate.
Possible Causes:
1 The "control switch" in the card reader is not short-circuited (disconnected when leaving the factory, and is in the off-line working state; when connected to a computer, it must be connected in a short-circuit state);
2 The computer and card reader cannot communicate properly and the controller cannot receive the opening command. (Check the computer serial port connection is normal, parameter settings are correct)
Fourth, the car over the gate.
Possible Causes:
1 The ground coil is not properly buried or the coil is broken or broken;
2 Vehicle detector power supply is insufficient (Max250mA) or sensing sensitivity is improperly adjusted (too high or too low);
3 The “COM†terminal of the ground-sensing detector is disconnected from or badly connected to the “GND†common ground of the barrier controller.
Fifth, with image contrast, but do not see the image into the parking lot monitoring interface.
Possible Causes:
1 The video card is not installed correctly (if the driver is installed incorrectly);
2 The camera is not powered on or the connection between the camera and the video card is incorrect.
3 The software parameters of the parking lot are not set correctly (if the entrance and exit are selected, no camera is selected).
Sixth, the automatic card machine can not issue a card (after detecting the vehicle and pressing the "take card" button, the card output machine does not respond or the card output machine has an action but cannot issue a card).
Possible Causes:
1 If you press the "take card" button, the card ejector does not respond, it may be that there is no card in the card ejector or the card is not powered (the power plug is off);
2 If the “take card†button is pressed, the card ejector moves but cannot eject the card. The card slot may be too small, and the card is stuck and cannot be ejected.
Seven, Chinese display does not show.
Possible Causes:
Chinese display power supply is bad; display power supply is bad;
VIII. When reading a card at an entry/exit card reader, the card number transmitted to the computer is sometimes correct (can be opened), and sometimes it cannot be opened.
Possible Causes:
1 The circuit is in strong interference (for example, the communication line and the AC power line are laid together);
2 The line is too long, beyond the effective communication distance (200M), the signal is severely degraded;
3 The card reader controls the mainboard ground (signal ground) and AC power ground (power ground) short circuit, causing communication interference;
Nine, click on "school hour" in the parking lot import and export monitoring interface, first appears "school hour", then prompt "communication error / failure" (after checking the hardware and equipment are intact).
Possible Causes:
1 The circuit is in strong interference (for example, the communication line and the AC power line are laid together);
2 The network expander is damaged and the input/output signal is distorted;
3 In the software setting, the communication delay setting is too low (usually the minimum is 200ms), too low will cause communication failure;
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Nuts
Nuts Categories:
About Nuts, it is a fastener used with a bolt,it can be divided into several categories:
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Standard Nuts or non-standard are available,such as Germany standard,and US standard,JiS standard etc.
And our Non-standard nuts can be produce according to drawings and samples.
Technology and property:
Nuts are used with Bolts , Washers etc.the grade in Germany standard:CL4.CL5.CL6.CL8,CL10,CL12
And in US standard/ASME:CL2, CL5, CL8, CL10
High Grade own high quality,the great important is how to control the material and production control and heat treatment 
We have ability to control the quality during production before sending to customers. We wish to do your best supplier of nuts in China
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Welcome all of you to contact with us,we promise to give our the best We are improving as your supporting.
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