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OTHER RS-232 SIGNALSPin 23, the Data Signal Rate Selector, is used to select between multiple transmission speeds when a modem is so equipped. Pins 12, 13, 14, 16, and 19 define a secondary data channel, complete with data, timing, and control signals. There was a time when a higher speed primary channel was used in conjunction with a lower speed secondary channel. The secondary channel is, for all intents and purposes, obsolete. |
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