Receive Control
| | Receivers are always enabled. In |
| Always Receive | a Half Duplex mode, you will |
| receive what you transmit |
| |
| | (sometimes called echo). |
| | Receivers are only enabled when |
| When NOT Tranmitting | not transmitting. In a Half |
| Duplex mode, you will not |
| |
| | receive what you transmit. |
| RS-422/485 Duplex Mode |
| Transmitters and receivers are |
| always enabled; ports can send |
Full Duplex | and receive simultaneously. |
| Used in four-wire |
| communication. |
| RTS is set to enable the |
Half Duplex using RTS | transmitters. Used in two-wire |
| communication. |
| DTR is set to enable the |
Half Duplex using DTR | transmitters. Used in two-wire |
| communication |
| Hardware automatically enables |
| the transmitters when |
| transmitting. Transmitters will |
Auto Toggle | turn off three bit-times after the |
| last stop bit of the last character, |
| regardless of baud rate. Used in |
| two-wire communication. |
8.To summarize the RS-422/485 output drivers enable options: The DSCLP-200/300’s ports may be configured for either full duplex or half duplex operation with this option. The default setting is the RS-422/485 ports are configured for full duplex operation with the RS-422/485 output drivers always enabled. In half duplex mode, the RS-422/485 transmitter may be enabled and disabled via the RTS (request to send) or DTR (data terminal ready) signals, or in auto-toggle mode, set to enable only when data is being transmitted. Both RTS and DTR are controlled through the Modem Control Register of the 16550.
9.Click the "Port Settings" tab and then click the "Advanced" button. The DSCLP-200/300 driver will display a custom Advanced Port Settings control, which allows the ports UART compatibility mode and FIFO threshold levels to be configured. The threshold values of
DSCLP/SSCLP-200/300 User's Manual | 33 |
