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iDP3221 User’s Manual
32
CITIZEN
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." If DTR/DSR has not been selected, the data from the host
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: DTR signal and TD
signal. The host side is immediately freed, since the data can be buffered up to 4 KB.
(1) DTR signal (See 7.3.1-(2))
(2) TD signal (See 7.3.1-(3))
7.3.6 Electrical Characteristics
RS-232C Circuit
Input (RD, DSR)
[Printer Side] [Host Side]
Output (TD, DTR)
[Printer Side] [Host Side]
Equivalent to MAX232
Mark=(-8V): At Busy Mark=(-8V): 1
Space=(+8V): At Busy Space=(+8V): 0
Equivalent to MAX232
RD
Mark=(-8V): Stop bit
Space=(+8V): Start bit
TD
DTR