Bit Order
Choose LSB (least significant bit) first or MSB (most significant bit) first. LSB first is normal, while MSB first is considered "reversed" from normal. This option reverses the order of the bits within each byte.
All options on the I/O Settings window are valid when in MSB mode except for parity. The parity must be None when using MSB bit order.
Bit reversal occurs when monitoring and transmitting data. For example, if the analyzer is monitoring data in LSB mode and sees 0000 0001 on the circuit, it displays this as hex 01. In MSB mode, the analyzer reverses the order of the bits as they come in and display this byte as 1000 0000, or hex $80.
When transmitting data, the analyzer reverses the bits before they are sent out over the circuit. For example, if you are transmitting data in LSB mode and you enter the pattern $01, the analyzer sends out 0000 0001. If you are transmitting in MSB mode and you enter the pattern $01, the analyzer bit reverses this and transmit 1000 0000.
The analyzer remembers what bit order was used to capture the data with. If you create a capture file with the bit order set to MSB, the data always is displayed in that form.
If you are monitoring HDLC or SDLC data and the bit order is set to MSB, it is probable that the CRC's is not calculated correctly.