CX400 User Guide
Communication Ports
CX400 printers are equipped with a standard Centronics parallel and an RS232 communication port, wired as shown below.
Serial Input Cable (DB9S)
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| Pin # | Description |
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| 2 | RXD (data to printer) |
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| 3 | TXD (data from printer) |
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| 4 | DTR, always high |
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| 5 | GROUND |
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| 6 | DSR, connected to pin 4, always |
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| high |
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| 7 | RTS (printer busy) |
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| 8 | CTS |
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| 1,9 | +5V |
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PN 9001107 Rev. A | Page 21 |