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iDP-3540/41 User’s Manual
CITIZEN 23/48
9. Serial Interface
9-1. Specifications
a) Synchronism : Asynchronous
b) Baud rate :
RS-232C type : 110, 150, 300, 600, 1200, 2400, 4800, 9600BPS
(Selected by user)
Current Loop : 110, 150, 300, 600, 1200BPS
Type (Selected by user)
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).