Citizen Systems iDP-562 User Manual download pdf (Page 19)

iDP-562 User’s Manual

CITIZEN

5.6 DATA Construction

5.6.1 Serial Data format

1. Start BIT

2. DATA BIT (+ Parity BIT)

3. Stop BIT (1 ~ 2 BIT)

(1) START BIT

At 1 / 2 BIT after (a), signal level is checked out, (b). When signal level is MARK, continuous search for START

BIT is made for the next bit.

(2) DATA BIT + PARITY BIT

DATA BIT and PARITY BIT are checked out every 1 / 2 BIT from the half point of START BIT, (b).

Signal level of these points (MARK = 1, SPACE = 0) are read as input DATA.

The sequence of these BIT is BIT 0, BIT 1 ~ PARITY BIT from START BIT.

(3) STOP BIT

STOP BIT is 1 or 2 BIT and its signal level is MARK. If SPACE LEVEL is read at STOP BIT, FRAMING

ERROR occurs.

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Citizen Systems iDP-562 User Manual Page 19