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Printer Interface Technical Information
RS-232 Interface
Signal Levels
For all RS-232 input and output signals, the Stripe printer follows both the Electronics
Industries Association (EIA) RS-232 and the Consultative Committee for International
Telegraph and Telephone (CCITT) V.24 standard signal level specifications.
RS-232 Connector Pinout
Pin No. Description
1 Chassis Ground
2 TXD (Transmit Data) output from the printer
3 RXD (Receive Data) input to the printer
4 RTS (Request To Send) output from the printer
5 CTS (Clear To Send) input to the printer
6 DSR (Data Set Ready) input to the printer
7 Signal Ground
20 DTR (Data Terminal Ready) output from the printer
NOTE:
Pin #’s 8-19 and 21-25 are not used and are unterminated.
Data signals are defined as either MARK or SPACE, while control signals are either
ACTIVE or INACTIVE. The voltage levels which represent these conditions are:
Data Signal RS-232 Voltage Level
MARK or INACTIVE = -3 to -25 VDC
SPACE or ACTIVE = +3 to +25 VDC
Hardware Control Signal Descriptions
Request To Send (RTS) is a control signal from the printer to the host computer. RTS is
always in the ACTIVE condition (positive voltage) whenever the printer is powered ON.
Clear To Send (CTS) is a control signal from the host computer to the printer. When
CTS is in the ACTIVE condition (positive voltage), the Stripe printer can transmit
status to the host. When CTS is in the INACTIVE condition (negative voltage), the
printer will not transmit any data.
When RTS/CTS handshaking is selected via DIP Switch # 7 at the rear of the printer,
the Data Terminal Ready (DTR) Control Signal output from the printer controls when
the host computer may send data. DTR ACTIVE (positive voltage), permits the host to
send data. When the printer places DTR in the INACTIVE (negative voltage) state, the
host must not send data.
NOTE: When XON/XOFF handshaking is selected, data flow is controlled by the ASCII
Control Codes DC1 (XON) and DC3 (XOFF). The DTR Control lead will have no effect.
Appendix
Appendix
65