Contrast adjustment: When enabled, the adjustment mode (monochrome model) can be entered through the touch screen's top right and top left corners. Color models have no contrast adjustment.
Brightness adjustment: When enabled, the adjustment mode can be entered through the bottom right and bottom left corners (color models only).
LCD Reverse (LG monochrome only): Set NORMAL or REVERSE to reverse black and white display.
3.4.3 Communication timeout and retry
Receive timeout (1-255 seconds): The maximum time GP waits for PLC response. Default 10 seconds. If it exceeds 30 seconds and the PC transmits the screen, an error may occur.
Retry count (0~255): The number of times GP resends data in case of communication error, default is 2 times.
3.5 PLC SETUP
3.5.1 1:1 Connection
Starting device/address in the system area: such as D00200.
Unit number: Consistent with PLC settings.
System area read size: Used for reading trend charts and other blocks, set to 0 if not in use to speed up communication.
3.5.2 n: 1 Multi link Connection
The starting address of the system area is set to 1:1.
Station number setting: Each GP must be assigned a unique station number (0-15).
Network information address: Assign 2 words to the connection and verification sections. The connection section records which station numbers' GPs have been registered; Verify the GP in actual communication. If both are consistent, communication is normal.
Custom settings: Communication priority can be selected - display priority (fast screen refresh, slightly slower touch response) or operation priority (fast touch response, slightly slower screen refresh). You can also set the touch exclusive function and exclusive time (0-2550 seconds).
3.6 Initialization Memory
This operation erases all screen data (but does not erase system settings, SIO protocol, and clock). Before execution, a password must be entered (either the universal password 1101 or the user's own password). Cannot be cancelled midway.
3.7 Time Setting (SET UP TIME)
Set the date and time of the internal clock. Note: The displayed time is only accurate to minutes, and the clock accuracy is affected by temperature.
3.8 Screen Settings (SET UP SCREEN)
Initial screen number: The screen number displayed after power on.
Alarm message character size: Set the alarm display font.
Online error display: Whether to display error messages in running mode.
3.9 Font Setting
Choose the character set used for running mode: ASCII, Korean, Traditional Chinese, Simplified Chinese, Japanese. If you choose Japanese, you can set the quality of Chinese characters to "high" (32 dots displayed when enlarged by 2 x 2) or "standard" (16 dots enlarged).
Chapter 4: Image Data Transmission - The Bridge from PC to GP
4.1 Hardware Connection
Use the download cable provided with the screen editing software (Dsub 25 pin male to PC serial port). Connect the cable to the tool connector on the back of the GP, and connect the other end to the RS-232C serial port of the PC (if the PC does not have a serial port, a USB to serial port adapter is required). Note: If using a serial mouse, please use a different serial port.
4.2 Transmission steps
Ensure that the GP is powered on (newly purchased GP must be powered on first).
Select 'TRANSFER SCREEN DATA' in GP offline mode.
Select "Send to GP" or "Receive from GP" in the PC software.
Starting transmission, the GP screen displays "Transferring, Please Wait".
After the transmission is completed, press the ESC key to return to the running mode.
If the initial screen number has been set during initialization, the screen will be displayed; Otherwise, return to the main menu.
Chapter 5: Operation Mode and Daily Operations
5.1 Enter operating mode
Automatic operation upon power on: After a delay in startup time, the initial screen is displayed and communication with the PLC begins.
Run from offline mode: Press "RUN" on the main menu.
5.2 Entering offline mode during operation
In operating mode, within 10 seconds, touch the top left corner of the screen (which can still be triggered if a switch is placed) to switch back to offline mode.
5.3 Forced Reset During Operation
At any time (including during operation), holding down the bottom right corner, top right corner, and bottom left corner at the same time can enter the forced reset screen, perform a reset, or switch to offline mode.

Chapter 6: Fault Diagnosis and Detailed Explanation of Error Codes
GP370 has a self diagnostic function (SELF-DIagnoSIS) that can detect display patterns, touch panels, memory checksums, frame buffers, tool connectors, and serial interfaces. The following are common running errors and solutions.
6.1 Error Message List and Handling
Solution to the meaning of error messages
SYSTEM ERROR (xx: xx) GP basic operation failure or damaged screen file records error codes, contact the dealer; If it automatically switches to offline mode during operation, it is necessary to perform memory initialization and retransmit image data.
ILLEGAL EXPRESS IN SCREEN DATA Address Overlap (such as system area and label address overlap) Check the address allocation in screen editing to ensure there is no overlap. For example, if the starting address of the system area is 100, and the starting address of a 32-bit tag is 99, it will occupy both 99 and 100, resulting in a conflict.