HMI OP 320 TEARDOWN
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.
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.
More info: Absolutelyautomation.com @absolutelyautom
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.
ELECTRONIC BOARDS AND MAIN COMPONENTS
MOST IMPORTANT SEMICONDUCTOR LIST IN MAIN BOARDPart # DescriptionScratched 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 RegulatorSP202EEN Low-Power, Slew-Rate-Limited RS-485/
RS-422 Transceivers74HC245D octal transceiver featuring non-inverting 3-state
bus compatible outputs in both send and receive directions
7705AC integrated-circuit supply-voltage supervisorsMAX 485 Low-Power, Slew-Rate-Limited RS-485/
RS-422 Transceivers
More info: Absolutelyautomation.com @absolutelyautom
MAIN BOARD
MOST IMPORTANT SEMICONDUCTOR LIST IN DISPLAY BOARDPart # DescriptionJXD 19264A LCD 192 x 64 graphic matrix display7660 Switched capacitor voltage converter
More info: Absolutelyautomation.com @absolutelyautom
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