notes dump

README.md

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+# RE-TM245P
+The end goal of this project is to convert a partially broken TM245P Pick and Place to OpenPNP
+while replacing as little hardware as possible. The difficulty in this is that the feeders and
+everything on the head are CAN bus controlled. In an effort to not replace these parts, the
+protocol will need to be reverse engineered.
+
+# Approaches
+
+## Smoothieware Port
+The Charmhigh conversion undertaken by others approaches leaving the controller largely intact
+and flashing a Smoothieware port onto the STM32. The repo notes suggest the Charmhigh used an
+STM32F4, which the TM245P also uses. Specifcally the STM32F407ZGT6.
+
+## 'Decap'
+In this approach the entire head unit will be bypassed. Ideally this could be accomplished by
+utilizing the existing IDC connector on the power/comm sub-board.
+
+# Reading
+
+https://www.eevblog.com/forum/manufacture/neoden-tm245p-teardown-and-upgrade/

eevblog_teardown/README.md

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+Note: This is copied from a 2018 EEVBlog post by Luiz Renault for posterity.
+https://www.eevblog.com/forum/manufacture/neoden-tm245p-teardown-and-upgrade/
+
+# post
+
+Hi.
+
+Tired of the painful process to setup the Neoden TM245P Pick and Place, I decided to make a mod to OpenPNP to export a CSV file compatible with the Neoden machine.
+
+This way I can reuse component database and check if required components are present or need to be installed on free feeders.
+
+But that isn't enough. I really want to install a vision system and make it compatible with OpenPNP to control the machine.
+
+Today I opened the bottom plate and collected some information to check if the upgrade is possible using the original electronics.
+
+Here I share my findings...
+
+The guts of the TM245P consists of:
+
+    a motherboard (model TY164) with TFT LCD and resistive touch
+    a power supply and control board (model TY131)
+    two microstep driver
+    two vacuum pumps
+    one air blower
+    a transformer
+
+![overview](./images/picture716-1.jpg "overview")
+
+The motherboard have a STM32F407ZGT6 and a RA8875L3N TFT LCD Controller. The SD card slot can be seen on the left side of the board.
+At the center there is a 26 pin IDC connector that goes to the power supply and control board.
+On the top a 3 pin SWD connector and on the right side a 2 pin connector that powers the vibration feeder can be seen.
+
+The board uses as power supply 24V that comes from the power supply and control board. There is a 5V step down regulator (LM2576S-5.0) that supplies the uC through a 3.3V Linear reg.
+The 5V rail are sent back to the power supply and control board.
+
+![overview](./images/picture716-4.jpg "overview")
+
+This is the microstep driver:
+
+
+![overview](./images/picture1-1.jpg "overview")
+
+The power supply and control board have 4 diode bridge rectifiers (GBU808 on bottom layer) with +100V, +30V, +12V and -12V labels.
+
+There are four step down regulators (LM2576T-ADJ): +30V->+24V, +30V->+24V, +12V->+9V e -12V->-9V
+
+And the following connectors:
+
+    P1 -> Transformer (label 220V)
+    P2 -> air blower (connected to AC input)
+    P3 -> Transformer (label 110V)
+    P4 -> AC input and on/off switch
+    P5 -> Transformer taps labeled 70V, 23V, 11V, 11V
+    P6 -> To motherboard
+    P7 -> Power Supply to step controller X axis (connected to 100V labeled line)
+    P8 -> Power Supply to step controller Y axis (connected to 100V labeled line)
+    P9 -> X axis step controller signals (EN, DIR, STEP)
+    P10 -> Y axis step controller signals (EN, DIR, STEP)
+    P11 -> To DB9 connector at the back of the equipment (CAN-H CAN-L JTMS e JTCK
+    P12 -> Endstop Y axis switch
+    P13 -> Pick and place head
+    P14 -> Vacuum Pump A
+    P15 -> Vacuum Pump B
+    P16 -> Endstop / origin Y axis switch
+    P17 -> Feeder block 1
+    P18 -> Feeder block 2
+
+The feeders and the head are controlled through a CAN bus connection. The same bus goes to the back DB9 connector.
+
+
+![overview](./images/picture716-2.jpg "overview")
+![overview](./images/picture393-1.jpg "overview")
+
+This is the 26 pin connector pinout from the motherboard:
+
+
+![overview](./images/picture476-1.jpg "overview")
+
+I tried to read the firmware but the uC have Level 1 Read Protection.
+
+The next step is to log the CAN communication while sending simple commands using the equipment GUI.
+
+Then I will check if the X and Y axis can be controlled through CAN messages.
+
+Does anybody have the CAN message specification?
+
+Anybody tried to mod this machine?
+
+Best Regards,
+
+Luiz Renault
+
+
+-------------------------------------------
+
+
+Hi today I placed a scope on the CAN_H and CAN_L signals on the DB9 back connector.
+
+But they are too noisy to be useful and I had open the Pick and Place head and monitor on the inner (uC) side of the CAN transceiver (SN65HVD230).
+
+I assumed a bit rate 512 kbit/s because the smallest pulse length.
+
+But the oscilloscope wasn't able to decode it. The problem is that the CAN bit stuffing is not present.
+
+Does anyone have any clue?
+
+-------------------------------------------
+
+
+Although it uses a CAN transceiver, I could see on the Placement Head board that the CAN_TX and CAN_RX signals were connected to the USART signals of the STM32F103C8 (PA9 and PA10).
+
+Then I was able to decode de USART 512kbit/s signal. It uses a binary format.
+
+![overview](./images/picture618-1.jpg "overview")