HMI OP 320 teardown

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Boards and internal components of HMI OP 320

OP320

OP 320 HMI is a monochrome graphic panel with 20 configurable keys. It's supposed manufacturer is XINJE Electric Co, but there is not a visual reference in the case nor in circuit boards. Its aspect is very similar to KINCO MD204L.

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This HMI cost around 40 dollars (shipment included!), is powered by 24 V DC and have RS-232 and RS-422 communication interfaces, its programmed using the RS-232 port using a proprietary software. Have multiple industrial communication protocols. so is a very attractive solution to interface microcontroller based systems, because its integrated display, keyboard, control logic, using only a serial port, all encased in an "industrial like" case that the manufacturer claims to be IP65 for front panel.

TEARDOWN PROCESS

To open the OP 320 case a 2.4 mm x 40 mm Phillips screwdriver is required

First, remove 24V power terminal and release the 4 screws that holds the back case. Then pull the main board to disconnect from the display board, the boards are connected to a 20 pin single line connector.

Carefully disconnect the membrane keyboard connector (9 pin single line). This allows to totally disconnect the main board. The last step is to remove the spacer and the 3 screws that hold together the display board with the front panel.

Teardown process of OP 320 HMI

ELECTRONIC BOARDS AND MAIN COMPONENTS

MOST IMPORTANT SEMICONDUCTOR LIST IN MAIN BOARD
Part # Description
Scratched info Microcontroller, looking the package and pin arrangement, probably an MCS-51 compatible with onboard RAM and FLASH
LM2576S-5.0 SWITCHER 3A Step-Down Voltage Regulator
SP202EEN Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
74HC245D octal transceiver featuring non-inverting 3-state bus compatible outputs in both send and receive directions
7705AC integrated-circuit supply-voltage supervisors
MAX 485 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

Main board

HMI OP 320 main board front and back

MOST IMPORTANT SEMICONDUCTOR LIST IN DISPLAY BOARD
Part # Description
JXD 19264A LCD 192 x 64 graphic matrix display
7660 Switched capacitor voltage converter

Display board

HMI OP 320 display board front and back

VIDEO

In the following video the detailed HMI teardown process is presented