5.2 Wiring
Since the
In general, DTE (Data Terminal Equipment) refers to the device that is leading the communication. Examples include PCs, terminals and some printers. DCE refers to the device being communicated with or con- trolled. Examples include modems, DSU’s (digital service units), printers and lab/factory equipment. In some situations, you may be able to get by with just three lines: data on RxD, TxD and ground.
Table 5.5: Terminal or PC (DTE) Connections
DB25 Male | DB25 Male or Female: Terminal | ||
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Pin | Signal | Pin | Signal |
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2 | TxD | 3 | RxD |
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3 | RxD | 2 | TxD |
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4 | RTS | 5 | CTS |
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5 | CTS | 4 | RTS |
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6 | DSR | 20 | DTR |
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7 | GND | 7 | GND |
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20 | DTR | 6 | DSR |
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8 | DCD | 8 | DCD |
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42 |