Appendix A System Interface Description
1. Serial Interface RS-232C / RS-422
1.1Interface Characteristics
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| Signal Description | Pin No. | Direction |
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PG | Protective Ground | 1 | - |
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TXD | Transmit Data (from printer to host) | 2 | OUTPUT |
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RXD | Receive Data (from host to printer) | 3 | INPUT |
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RTS | Request to Send (printer is requesting data transfer from host) | 4 | OUTPUT |
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CTS | Clear to Send (host is ready to receive data from printer) | 5 | INPUT |
DSR | Data Set Ready (host is requesting data transfer from printer, | 6 | INPUT |
| can not be used for flow control, internaly set to "1") |
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SG | Signal Ground | 7 | - |
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DTR | Data Terminal Ready (printer is ready to receive - see also on the | 20 | OUTPUT |
| following pages the data communication protocols for detail meaning |
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| Signal Description | Pin No. | Direction |
PG | Protective Ground | 1 | - |
RDA | Receive Data (from host to printer) | 3 | INPUT |
SDA | Send Data (from printer to host) | 9 | OUTPUT |
SDB | Not Send Data (from printer to host) | 10 | OUTPUT |
RDB | Not Receive Data (from host to printer) | 18 | INPUT |
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STransmission rate: 600, 1200, 2400, 4800, 9600, or 19200 baud
S | Parity: | even, odd, none, or ignore |
S | Word length: | 7, or 8 bits |
SNumber of stop bits: In receive mode the printer accepts 1, or 2 stop bits. The printer transmits always two bits.
Transmission Protocols:
SDTR - Ready/Busy (only
SXON/XOFF
SXON/XOFF + DTR
