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3
votes
0answers
345 views

Identifying a toner chip and it's communication protocol to re-program it

I need help identifying a chip and how to reset it from a new brother toner cartridge TN227 and TN223. This comes from the new Brother HL-L3230CDW laser printer. There is currently no information on ...
1
vote
0answers
92 views

What is this RS-485 communication protocol/

I am trying to reverse engineer a two wire RS-485 standard serial bus interface to talk to a samsung heat pump. Here are some hex commands I was able to sniff. Every message starts with 0x32 and ...
5
votes
1answer
605 views

How to identify SWD (Serial Wire Debug) pinout?

When trying to access firmware, JTAG and SWD can be really helpful to the reverse engineer. When looking at an unknown board/device tools such as JTAGEnum or JTAGulator are really helpful in ...
0
votes
1answer
547 views

Finding JTAG/UART Connections

I need help identifying the UART or JTAG connections on this board. I would like to dump the firmware using a pirate bus.
4
votes
0answers
274 views

Trouble finding the right Checksum algorithm

After reading a lot of posts here and their solutions, Punching lines in CRC calculators for several days now. I can't seem to find on which Checksum this code is based. Background This is a data ...
3
votes
0answers
869 views

Reverse engineering unknown RS232/UART binary protocol

Background story For couple of days I'm trying to crack the protocol used the old medical device, in order to collect data for a research in an automated way. The device in question is Novametrix ...
5
votes
2answers
393 views

Thought I found serial port - broke embedded device instead! Help?

Well another weekend has gone by and my tinkering has caused another device to (potentially) bite the dust. I've been playing around with a couple of Slingboxes, an M1 and a 500. Today was the M1. I ...
7
votes
2answers
1k views

Router's serial port only outputs garbage

I'm trying to reverse engineer a 2Wire ADSL modem/router, mainly for practice. I opened it and found a serial port (with a header conveniently already in place) but I'm not getting any useful data out ...
9
votes
1answer
2k views

RS-485 Checksum Reverse Engineering (Watlow EZ-Zone PM)

I am trying to reverse engineer a two wire RS-485 standard serial bus interface to talk to a Watlow EZ-Zone PM of which I have not been able to find any documentation of the protocol. I have managed ...
3
votes
1answer
831 views

Reversing serial RS485 half duplex bus protocol understanding

I have a master & slaves setup in which the slaves only respond when spoken too. I can snoop & record an existing master/slaves conversation. I have an extra slave device that I would like ...
1
vote
0answers
126 views

Serial console stops output abruptly

I've been playing with a device similar to this one: EPC3208G. I've connected GND, TX and what i think is an RX pins via ttl adapter. Using minicom, 8N1 and baudrate of 115200, I managed to get some ...
15
votes
2answers
1k views

Determining the serial port protocol of a typewriter

How can i determine the serial protocol of a electric typewriter? some electric typewriters have a serial port in the back and it is a shape that is not commonly used today. I am planing on ...