Alternatively you can just connect the 3 wires in the following way.
Host 25S | Printer 9P | Host 9S | Printer 9P | |||
(PC or compatible) | (PC or compatible) |
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TX 2 | 2 RX | TX 3 | 2 RX | |||
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RX 3 | 3 TX | RX 2 | 3 TX | |||
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GND 7 | 5 GND | GND 5 | 5 GND | |||
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pin 4 |
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pin 5 |
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pin 6 |
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pin 20 |
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The most simple way to connect to other hosts (not PC compatible) or terminals is:
Printer | Terminal/Host |
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Pin 2- RxData | TxData |
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Pin 3- TxData | RxData |
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Pin 5- Ground | Ground |
In general as long as the data quantity is not too large or you use Xon/Xoff as flow control, there will be no problem at all.
Baud rate: | 2400, 4800, 9600, 19200 and 38400. |
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Data format: | always 8 data bits, 1 start bit and 1 stop bit. |
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Parity : | always non parity |
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Handshaking : | XON/XOFF as well as CTS/RTS (hardware |
| flow control). |
If you run an application with the bundled printer driver under Windows and use the serial port, you should check the above parameters and set the flow control to “Xon/Xoff” or “hardware”. However, a parallel connection is HIGHLY RECOMMENDED for connection to a
Interface Specifications 35
