Chapter 3 |
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| Hardware | ||
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| Pin # | Pin # | Signal | Description |
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| DB9 |
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| B16 | 8 | CTS4* | Clear To Send 4 – Indicates external serial communications device is |
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| ready to receive data. Used as hardware handshake with RTS4 for low |
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| level flow control. |
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| RX4+ | RX4+ – If in RS485 or RS422 mode, this pin is Receive Data 4 +. |
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| B17 | 4 | DTR4* | Data Terminal Ready 4 – Indicator Serial port 4 is powered, initialized, |
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| and ready. Used as hardware handshake with DSR4 for overall |
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| readiness to communicate. |
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| B18 | 9 | NC | Not connected |
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| B19 | 5 | GND | Ground |
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| B20 | NC | NC | Not connected |
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Notes: The shaded area denotes power or ground. RS232 signals are listed first followed by RS485/RS422. The signals marked with * = Negative true logic.
42 | Reference Manual | ReadyBoard 700 |