Serial Terminal

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What is the least significant bit/byte?

I'm trying to send the following hex command through a serial terminal software (Realterm) to an RFID reader but:
0x04 0x00 0x01 0x00 0x00
but in the datasheet it's written:
In the process of serial communication, the least significant bit of one byte is transmitted first and the least significant byte of command data sequence is transmitted first.

What does that mean?

Depending on whether your system is little endian or big endian it is either the leftmost bit or rightmost bit. It is the bit/byte that represents the smallest value.
I would say that following most modern conventions that the bits are being transmitted right to left.

so your hex command in binary looks like this
00000100 00000000 00000001 00000000 00000000

that means when you transmit it it will be transmitted in reverse one bit at a time, so the order of the bits coming in to the other side would be

00000000 00000000 10000000 00000000 00100000

Hope this helps!

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