![](/images/new-backgrounds/1186300/18630065x1.webp)
Jumpers J6, J8
| Tx ENABLE | 6 | ||
| Tx ENABLE | 5 | ||
Tx ENABLE | 4 | |||
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| 6 | |
| Tx ENABLE |
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| Tx ENABLE | 5 | ||
| Tx ENABLE | 4 | ||
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| 6 | |
Tx ENABLE | ||||
Tx ENABLE | 5 | |||
Tx ENABLE | 4 |
3 | Rx ENABLE |
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2 | RTS | |
1 | DTR |
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3 | Rx ENABLE |
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2 | RTS | |
1 | DTR |
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3 | Rx ENABLE |
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2 | RTS | |
1 | DTR |
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Figure 23 --- Half- or full-duplex selection
AUXOUT |
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| - |
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| Driver |
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| TXEN |
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6 | 3 |
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5 | 2 |
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| AUXIN | |
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| Receiver |
4 | 1 |
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| RXEN |
XCLK |
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RTS |
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CTS |
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RCLK |
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DTR |
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| 6 | 3 |
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DSR |
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DCD |
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| 5 | 2 |
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RI |
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4 1
+
-
Figure 24 --- Output control block diagram
Quatech | 33 |