Data Receiving Control; Buffering; Electrical Characteristics - Citizen CBM-270 User Manual

7.3.4

Data Receiving Control

If DTR/DSR control has been selected, the data from the host side will be received when the BUSY signal
is at "Low," but not received when at "High."
side will be received after sending XON, but not after sending XOFF.
7.3.5

Buffering

To transfer the data to the input buffer, there are two control signals available:
signal. The host side is immediately freed, since the data can be buffered up to 2 KB.
(1) DTR signal (See 7.3.1-(2))
(2) TXD signal (See 7.3.1-(3))
7.3.6

Electrical Characteristics

RS-232C Circuit
Input (RXD, DSR)
Output (TXD, DTR)
[Printer Side]
Equivalent MAX232
[Printer Side]
Equivalent to MAX232
Mark=(-8V): At Busy
DTR
Space=(+8V): At Busy
If DTR/DSR has not been selected, the data from the host
[Host Side]
Mark=(-8V): Stop bit
RXD
Space=(+8V): Start bit
[Host Side]
Mark=(-8V): 1
TXD
Space=(+8V): 0
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CBM-270 User's Manual
DTR signal and TXD
CITIZEN