Appendices |
A.2. Serial Ports 1 through 8 (DB9 Male)
The Serial Ports are 9 pin male, wired in a DTE configuration similar to that of an A computer. Figure A.1 and the table below describe the Serial Port interface.
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| Not |
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Pin | Signal | I/O | Connected | Connected |
1 | DCD | Input | - | To Control Port Pin 8 |
2 | RXD | Input | - | To Control Port Pin 3 |
3 | TXD | Output | Low | Follows Control Port Pin 2 |
4 | DTR | Output | Low | Follows Control Port Pin 20 |
5 | GND | Signal Ground |
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6 |
| Open |
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7 | RTS | Output | Low | Follows Control Port Pin 4 |
8 | CTS | Input | - | To Control Port Pin 5 |
9 |
| Open |
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A.2.1. RS422 Line Driver Option
Each Serial Port may be configured with an RS422 balanced line driver. These long distance line drivers can extend high speed transmission distance to 4,000 feet using 2 twisted pair wiring. Only the TXD and RXD signals are transmitted. The DCD and CTS signals are set to high. Figure A.2 below describes the RS422 Serial Port interface.
Note: Handshake signals are not passed. All other pins are open.
