Citizen Systems iDP3420 - Manual (Page 53)

iDP3420/3421/3423 User’s Manual
37 CITIZEN
10.3.6 Electrical Characteristics
(1) RS-232C circuit
Input (RXD, DSR, mRXD)
[Printer Side] [Host Side]
Output (DTR, TXD, mTXD, RCH, RTS, FAULT)
Equivalent to MAX232
Mark=(-8V): At Busy Mark=(-8V): 1
Space=(+8V): At Ready Space=(+8V): 0
(2) Others
•
RESET : A signal to reset the entire printer.
•
PE : A signal to show that the paper has run out. Normal at the "LOW" level, but turned
to the "HIGH" level when the paper has run out.
•
GND : Signal ground
•
FG : Frame ground
Equivalent MAX232
RXD
Mark=(-8V) : Stop bit
Space=(+8V): Start bit
DTR TXD