CITIZEN CBM-270 - Manual (Page 41)

CBM-270 User’s Manual
CITIZEN 41
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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.
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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 2
KB.
(1) DTR signal (See 7.3.1-(2))
(2) TXD signal (See 7.3.1-(3))
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RS-232C Circuit
Input (RXD, DSR)
[Printer Side] [Host Side]
Output (TXD, DTR)
[Printer Side] [Host Side]
Equivalent to MAX232
Mark=(-8V): At Busy Mark=(-8V): 1
Space=(+8V): At Busy Space=(+8V): 0
Equivalent MAX232
RXD
Mark=(-8V): Stop bit
Space=(+8V): Start bit
TXD DTR