Citizen iDP-460 User Manual page 33

(4) Signal polarity
RS-232C
•Mark
= Logic "1" (-3 V to -12 V)
•Space
= Logic "0" (+3 V to +12 V)
(5) Received data (RD signal)
RS-232C
• Mark
= 1
• Space
= 0
(6) Reception control (DTR signal)
RS-232C
•Mark
: Data transfer disabled
•Space
: Data transfer enabled
(7) Transmission control (TD signal)
•Status transmission
P-250 = Transmits "A"(41h)
P-900R = Transmits "H"(48h)
•Printer state transmission
Transmits the data indicating the 1-byte state. (See 10. PRINT CONTROL FUNCTIONS)
iDP-460 User's Manual