Samsung SRP-350PG - SRP 350 B/W Direct Thermal Printer Service Manual

Also see for SRP-350U: Operator's manual Operator's manual Service manual

2 Product Specifications2-102-5 Interface Specifications2-5-1-(c) Cable ConnectionFigure 2-7 RS-232C Cable Connection2-5-1-(d) Signal DescriptionPin No. Signal Name Signal Direction FunctionBODY Frame GND - Frame Ground2 TXD Output Transmit Data3 RXD Input Receive Data6 DSR InputThis signal indicates whether the host computer can receive data. (H/W flow control) MARK(Logic1) : The host can receive a data. SPACE(Logic0) : The host can not receive a dataThe printer transmits a data to the host, after confirming this signal.When XON/XOFF flow control is selected, the printer does not check this signal.7 Signal GND - Signal Ground20Note : Refer to the Operation Manual about the busy condition.DTR OutputThis Signal indicates whether the printer is busy. (H/W flow control) MARK(Logic1) : The printer is busy SPACE(Logic0) : The Printer is not busyThe host transmits a data to the printer, after confirming this signal.When XON/XOFF flow control is selected, the host does not check this signal.Table 2-12 RS-232C Pin Description(S.G) 1(TXD) 2(RXD) 3(DSR) 6(DTR) 20(S.G) 71 (S.G)2 (TXD)3 (RXD)4 (RTS)5 (CTS)6 (DSR)20 (DTR)7 (S.G)PRINTERSIDE(25P)HOSTSIDE(25P)(S.G) 1(TXD) 2(RXD) 3(DSR) 6(DTR) 20(S.G) 71 (S.G)3 (TXD)2 (RXD)7 (RTS)8 (CTS)6 (DSR)4 (DTR)5 (S.G)PRINTERSIDE(25P)HOSTSIDE(9P)Samsung Electro-Mechanics4 RTS Outnput Ready To Send5 CTS Input Clear To Send