Citizen Systems CBM-291 Manuel d'utilisateur télécharger pdf (Page 31)

CITIZEN 31

7.5 Data receiving control

When DTR/DSR control having been selected, with BUSY signal at "LOW", data from the

host side are received. With the signal at "HIGH", they can not be received.

When DTR/DSR control not having been selected, after X-ON transmission, data is

received from the host side. No transmission of data can take place after X-OFF is

transmitted.

7.6 Buffering

Data transfer to the input buffer include DTR signals and TD signals as the control signals

concerned.

(1) DTR signals (See 7.2. (2).)

(2) TXD signals (See 7.2. (3).)

7.7 Electrical characteristics

(1) RS-232C Circuit

Input (RXD, DSR)

RXD Mark = (-8V) : Stop bit

MAX 232 equivalent Space = (+8V) : Start bit

Output (DTR, TXD)

MAX 232 equivalent

DTR (-8V) : When busy TXD Mark = (-8V) : 1

(+8V) : When ready Space =(+8V) : 0

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Citizen Systems CBM-291 Manuel d'utilisateur Page 31