Chapter 3 |
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Table | ||||
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| 6 | 8 | CTS3* | Clear To Send 3 – Indicates external serial communications device is |
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| ready to receive data. Used as hardware handshake with RTS3 for |
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| low level flow control. |
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| RX3+ | RX3+ – If in RS485 or RS422 mode, this pin is Receive Data 3 |
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| 7 | 4 | DTR3* | Data Terminal Ready 3 – Indicates Serial port 3 is powered, |
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| initialized, and ready. Used as hardware handshake with DSR3 for |
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| overall readiness to communicate. |
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| 8 | 9 | RI3* | Ring Indicator 3 – Indicates external serial communications device is |
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| detecting a ring condition. Used by software to initiate operations to |
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| answer and open the communications channel. |
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| 9 | 5 | GND | Ground |
| 10 | NC | NC | Not connected |
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| 11 | 1 | DCD4* | Data Carrier Detect 4 – Indicates external serial communications |
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| (COM4) |
| device is detecting a carrier signal (i.e., a communication channel is |
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| currently open). In direct connect environments, this input will be | |
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| driven by DTR4 as part of the DTR4/DSR4 handshake. |
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| 12 | 6 | DSR4* | Data Set Ready 4 – Indicates external serial communications device is |
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| powered, initialized, and ready. Used as hardware handshake with |
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| DTR4 for overall readiness to communicate. |
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| 13 | 2 | RXD4 | Receive Data 4 – Serial port 4 receive data in |
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| RX4- | RX4- – If in RS485 or RS422 mode, this pin is Receive Data 4 |
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| 14 | 7 | RTS4* | Request To Send 4 – Indicates Serial port 4 is ready to transmit data. |
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| Used as hardware handshake with CTS4 for low level flow control. |
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| TX4+ | TX4+ – If in RS485 or RS422 mode, this pin is Transmit Data 4 +. |
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| 15 | 3 | TXD4 | Transmit Data 4 – Serial port 4 transmit data out |
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| TX4- | TX4- – If in RS485 or RS422 mode, this pin is Transmit Data 4 |
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| 16 | 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 |
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| low 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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| 17 | 4 | DTR4* | Data Terminal Ready 4 – Indicates Serial port 3 is powered, |
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| initialized, and ready. Used as hardware handshake with DSR4 for |
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| overall readiness to communicate. |
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| 18 | 9 | NC | Not connected |
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| 19 | 5 | GND | Ground |
| 20 | NC | NC | Not connected |
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Note: The shaded area denotes power or ground. Signals are listed in the following order: RS232 followed by RS485/RS422
Keyboard/Mouse Interfaces
Keyboard Interface
The Super I/O chip (W83627HF) provides the signal lines for the PS/2 keyboard through the keyboard connector (J1A), which is fully PC/AT compatible.
20 | Reference Manual | MightyBoard 821 |