Interface specifications – Citizen Systems CBM-253 User Manual

Page 38

CBM-253 User’s Manual

CITIZEN

INTERFACE SPECIFICATIONS

5.1 Serial interface

Specifications (Conform to RS-232C)

Synchronizing system

: Asynchronous system

Handshaking

: DTR/DSR control or Xon/Xoff control

Baud rates

: 1200, 4800, 9600, 19200 (Selected by the user)

Data length

: 7 or 8 bit length (Selected by the user)

Parity

: Odd/Even/None (Selected by the user)

Signal level

: Mark= -3 ~ -15V Logic '1'

: Space = +3 ~ +15V Logic '0'

Compatible interface connectors

Printer side

: 25-pin connector

17-13250 (DDK) equivalent product

Cable side

: 25-pin connector

17-23250 (DDK) equivalent product

Connector's pin configuration

Connector pin

Signal name

Input/output

Function

1 FG –

Frame

ground

2 T

D Output

Sending

data

3 R

D Input

Receiving

data

6 DSR

Input

Data

set

ready

DTR

Output

Data terminal ready

7 SG –

Signal

ground

Note: Shielded type cables should be used.

Explanation of input and output signals

(1) RxD

This is the serial receiving data signal. On the occurrence of framing errors, overrun errors or parity errors,

this data will either be rejected or printed as ' ?'. according to the DSW2-7 switch condition.