Connection with host:
Host 25S |
| Printer 9P |
| Host 9S |
| Printer 9P |
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(PC or compatible) |
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DTR 20 | ……….. | 1 DSR |
| DTR 4 | ……….. | 1 DSR |
DSR 6 | ……….. | 6 DTR |
| DSR 6 | ……….. | 6 DTR |
TX 2 | ……….. | 2 RX |
| TX 3 | ……….. | 2 RX |
RX 3 | ……….. | 3 TX |
| RX 2 | ……….. | 3 TX |
CTS 5 | ……….. | 7 RTS |
| CTS 8 | ……….. | 7 RTS |
RTS 4 | ……….. | 8 CTR |
| RTS 7 | ……….. | 8 CTS |
GND 7 | ……….. | 5 GND |
| GND 5 | ……….. | 5 GND |
Alternatively you can just connect the 3 wires in the following way.
Host 25S |
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| Printer 9P |
| Host 9S |
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| Printer 9P |
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(PC or compatible) |
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| (PC or compatible) |
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TX 2 | ……….. | 2 RX |
| TX 3 | ……….. | 2 RX | |||||
RX 3 | ……….. | 3 TX |
| RX 2 | ……….. | 3 TX | |||||
GND 7 | ……….. | 5 GND |
| GND 5 ……….. | 5 GND | ||||||
pin 4 |
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| pin 4 |
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pin 5 |
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| pin 6 |
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pin 6 |
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| pin 7 |
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pin 20 |
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| pin 8 |
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The simplest way to connect to other hosts (not PC compatible) or terminals is:
Printer
Pin 2- RxData
Pin 3- TxData
Pin 5- Ground
Terminal/Host
…………TxData
…………RxData
…………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 flow control issues.
