Data Receiving Control; Buffering; Electrical Characteristics - Citizen iDP-3221 Series 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 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)
Output (TD, DTR)
[Printer Side]
Equivalent to 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
RD
Space=(+8V): Start bit
[Host Side]
Mark=(-8V): 1
TD
Space=(+8V): 0
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iDP3221 User's Manual
DTR signal and TD
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