Citizen Systems 3541, iDP-3540 user manual Serial Interface

: Asynchronous

:

: 110, 150, 300, 600, 1200, 2400, 4800, 9600BPS (Selected by user)

: 110, 150, 300, 600, 1200BPS (Selected by user)

iDP-3540/41 User’s Manual

9. Serial Interface

9-1. Specifications

a) Synchronism b) Baud rate

RS-232C type

Current Loop Type

c) Composition of one word :

Start bit	: 1 bit
Data bit	: 7 or 8 bit (selected by user)
Parity bit	: Odd, even or no parity (Selected user)
Stop bit	: 1 bit or more
d) Signal Polarity	:
RS-232C type	: *Mark = Logic “1” (-3V to –12V)
	*Space = Logic “0” (+3V to +12V)
Current Loop	: *Mark = Logic “1” (Current ON)
Type	*Space = Logic “0” (Current OFF)
TTL type	: *”H” level = Logic “1” Ref. to 8-3-2
	*”L” level = Logic “0”

e) Received Data :

RS-232C & Current Loop (RD signal) *Mark = 1 *Space = 0

f) Receiving Control (RD signal)

RS-232C :*Mark: Data Transfer not possible *Space: Data Transfer possible

Current Loop : *Mark: (Current ON): Data Transfer possible *Space (Current OFF): Data Transfer not possible

g) Transmission Control (TD signal)

DC1 code (11H) “X” ON:	Data Receiving possible
DC3 code (13H) “X” OFF:	Data Receiving not possible

However, this is valid only for type B input buffer (7K).

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