D-4Interface InformationPin Direction Signal Description31 To printer Init L Set to high for Reverse Channel operation32 From printer DataAvail L Reverse channel: Data 0 and 433 Not used34 Not used35 Not used36 To printer SelectIn L Set to high for Reverse ChannelSerial InterfaceUse the Digital BC16E cable or equivalent. If you prepare a cable separately, the cableconnector at the printer side should be a male Modified Modular Jack (MMJ) or theequivalent that conforms to EIA standards.The following table shows the pin assignments. In the table:• “Input” denotes a signal from the computer to the printer.• “Output” denotes a signal from the printer to the computer.• The signal level for mark state (logical 1) is -5 V to -6 V; for space state (logical 0), it is+5 V to +6 V.Pin Signal Direction DescriptionNo. Name1 Ready Out Output Data Terminal Ready2 Transmit Data + Output This pin carries information from the printer tothe computer.3 Transmit Data - Output Common signal level. This pin carriesinformation from the printer to the computer.4 Receive Data - Input Common signal level at the computer side.This pin carries information from the computerto the printer.5 Receive Data + Input This pin carries information from the computerto the printer.6 Ready In Input Optional (available as Data Set Ready)
