Citizen PPU-231 manual Electrical Characteristics RS-232C Circuit, Output TXD, DTR Printer Side

PPU-231 User’s Manual

7.3.4Data 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.

7.3.5Buffering

To transfer the data to the input buffer, there are two control signals available: DTR signal and TXD 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)TXD signal (See 7.3.1-(3))

7.3.6Electrical Characteristics RS-232C Circuit

Input (RXD, DSR)

[Printer Side] [Host Side]

Mark=(-8V): Stop bit

RXD

Space=(+8V): Start bit

Equivalent to MAX232

Output (TXD, DTR)

[Printer Side] [Host Side]

Equivalent to MAX232
Mark=(-8V): At Busy	Mark=(-8V): 1
DTR	TXD
Space=(+8V): At Busy	Space=(+8V): 0

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