Appendix B Host Computer Interface
3. Serial Interface (Option)
3.1 RS-232C Interface
The pins of the printer’s
Pin | In/out | Signal | Description |
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1 | - | FG | Frame ground |
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2 | Out | TXD | Transmit Data |
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3 | In | RXD | Receive Data |
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4 | Out | RTS | Request To Send |
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5 | In | CTS | Clear To Send |
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6 | In | DSR | Data Set Ready |
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7 | - | SG | Signal Ground |
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20 | Out | DTR | Data Terminal Ready |
Brief descriptions of the signals follow.
FG - Frame Ground - (Pin 1)This pin is connected directly to the printer frame.
TXD - Transmit Data - (Pin 2)This output carries asynchronous data sent by the printer to the computer. It is used mainly in handshaking protocols.
RXD - Receive Data - (Pin 3)This input carries serial asynchronous data sent by the computer to the printer.
RTS - Request To Send - (Pin 4)This output is always held high (above 3 volts).
CTS - Clear To Send - (Pin 5)DSR - Data Set Ready - (Pin 6)Unused.
SG - Signal Ground - (Pin 7)All signals can transmit between the printer and the host computer to send each signal with a signal ground.
DTR - Data Terminal Ready - (Pin 20)This output is used as a buffer
The voltage levels of the interface signals conform to EIA RS- 232C specifications. SPACE is from 3 volts to 15 volts. MARK is from
4. RS-232C Protocol
A protocol is a set of rules the computer follows in sending data to the printer. They are indicated on the status page. Parameters can be changed from the operator panel. See Changing Serial Interface Modes on page
Parameter value | Baud rate |
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12 | 1200 |
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24 | 2400 |
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48 | 4800 |
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96 | 9600 |
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19 | 19200 |
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38 | 38400 |
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57 | 57600 |
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11 | 115200 |
The factory default setting is 9600 baud.
H2: Data bits7 or 8; the factory default setting is 8.
H3: Stop bits1 or 2; the factory default setting is 1.
H4: ParityParameter value | Meaning |
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0 | None |
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1 | Odd |
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2 | Even |
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3 | Ignore |
The factory default setting is None (0 on the status printout).