Hi,
ARM STM32F103_C4 (IC603) data exchange with the main MPU 89C51RC -UM (IC11) occurs through connectors J710B-J710B (pin3-TX, pin4 -RX).
These buses (RS232) are also connected to the J606 pin3-TX technology connector; pin5 -RX.
This is the only connector through which you can access SW or perform calibration (in the traditional sense).
In this case, the module itself (PCB: 640-3081J-Z-001 _IMG_) must be removed.
As far as I understand, APC (Schneider Electric) planned to use technology for managing and servicing UPS of this generation via the cloud and, probably, by for this reason it was created.
ARM STM32F103_C4 (IC603) communicates with the control/display panel, NMC and RJ50-10 RTU.
Moreover, the navigation buttons are controlled based on ADC (PB1 pin27) and resistors corresponding to the values of:
-R200-604E “DOWN”;
-R201-1.2k "UP";
-R202-2.43k "ENTER";
-R203-3.01k "Escape"
All of them are connected to the midpoint of the divider made of resistors
(R205-2k +5V) * (R203-3.01k GND).
Pins PB10-pin29 (TX), PB11-pin30(RX) via IC601 (MAX3232) are connected to the RTU connector RJ50-10 pin2 (TX) and pin 8 (RX).
Pins PA2-pin16 (TX), PA3-pin17(RX) - directly via connectors J702B/J702A (pin5-RX, pin6-TX) connected to connector J2 and via a cable to NMC (AP9630, AP9635 pin8/9 [SUMX v6. 4.6]).
J602 JTAG - connector for programming the module and binding to a specific type of UPS.
IC904 93LC66 can be read. Most likely it's MAC/WWN.
SW update is carried out via NMC.
Most likely you downloaded the wrong version.
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You can find answers to many questions and the firmware you need on the forum:
https://community.se.com/t5/forums/searchpage/tab/message?advanced=false&allow_punctuation=false&q=STM1500 -
I apologize for the boring description, there is no other way.