CITIZEN iDP3410 - Manual (Page 41)

iDP3410 User's Manual
27 CITIZEN
(8) RCH
When the printer is ready to receive, this signal is turned to Space. This signal line is the same as
DTR.
(9) mTXD
TXD signal for the diode gate.
(10) mRXD
RXD signal for the diode gate.
(11) FG
This is a Frame Ground signal.
(12) GND
This is a common ground on the circuit.