Digi NS7520 manual Differential Manchester 111. a 1 is

S e r i a l C h a n n e l r e g i s t e r s

Bit	Access	Mnemonic	Reset	Description
TENC/RDEC continued				NRZI-Space (011). A 0 is represented by
				a transition at the beginning of the
				bit-time; the level that appears during the
				previous cell us reversed. A 1 is
				represented by the absence of a
				transition at the beginning of the bit cell.
				FM0 (100). A 0 is represented by a
				transition at the beginning of the bit-time
				followed by another transition in the
				middle of the bit-time. A 0 is represented
				by a transition only at the beginning of
				the bit-time.
				FM1 (101). A 1 is represented by a
				transition at the beginning of the bit-time
				followed by another transition in the
				middle of the bit-time. A 0 is represented
				by a transition only at the beginning of
				the bit-time.
				Manchester (110). A 1 is represented by
				a high level during the first half of the bit-
				time and a low level during the second
				half of the bit-time. A 0 is represented by
				a low level during the first half of the bit-
				time and a high level during the second
				half of the bit-time.
				Differential Manchester (111). A 1 is
				represented by a transition at the center
				of the bit-time, with the opposite polarity
				from the transition at the center of the
				preceding bit-time. A 0 is represented by
				a transition at the center of the bit-time
				with the same polarity as the transition at
				the center of the preceding bit-time. In
				both cases, there are transitions at the
				beginning of the bit-time to set up the
				level required to make the correct center
				transition.
				See Figure 27, "Data coding example," on
				page 235 for an illustration of the transmit
				and receive coding methods.
D05:00	N/A	Reserved	N/A	N/A

Table 88: Serial Channel Control Register B bit definition

2 3 4 N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v . D 0 3 / 2 0 0 6