![]() ![]() For example, a header byte of 0b11000010 (0xC2) has the first packet in sequence bit (0b10000000) set, the last packet in sequence bit (0b01000000) set, and has a payload length of 0b00000010 (2). The 1 byte header is made up of a single bit indicating if this packet is the first in the sequence of packets encapsulating a particular message, another single bit that indicates if this is the last packet in a sequence, and a 6 bit unsigned integer representing the length of the payload in the current packet. A 64 byte USB HID packet is then constructed from a 1 byte header, a chunk of the message, and sometimes some extra bytes to make the packet exactly 64 bytes regardless of the size of the chunk. ![]() ![]() Messages to be sent over USB are split into chunks with a maximum size of 63 bytes. The MSR605's serial protocol is documented in section 6 of the MSR605 Programmer's Manual. The MSR605X uses 64 byte USB HID packets to encapsulate what appears to be the MSR605's serial protocol. The MSR605X appears as a USB HID device and uses a protocol that appears to be a small wrapper around the older serial protocol used by other MSR This is an in progress library for the MSR605X magstripe reader/writer. WIP MSR605X magstripe reader/writer library ![]()
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