DS74 Serial I/O Module
Status
Displays the current configuration of each I/O port.
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PortDevice | Baud Word Stop | ParityHandshakeLineDrive | ||||||||||||
| Type | Name | Rate Size Bits | DTR | RTS | |||||||||
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RPC | Device A | 9600 | None None | HI | HI | |||||||||
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RS232 Device B | 9600 | None None | HI | HI | ||||||||||
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RS232 Device C | 9600 | None None | HI | HI | ||||||||||
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RS232 Device D | 9600 | None None | HI | HI | ||||||||||
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Strike ENTER to continue
Serial Port Configuration
Since the DS74 I/O modules use different serial port configurations. Handshaking, Baud Rate, Word Size, Stop Bits, and Parity can all be configured through the HOST module using the menus. The default settings are 9600bps, 8 data bits, no parity, one stop bit, RTS and DTR High.
Select 2), the peripheral module responds asking for a port number:
Enter Serial Port Number (? = Help, ENTER = Exit) :1
Type the port number, press <cr> and the unit responds:
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PortDevice | Baud Word Stop | ParityHandshakeLineDrive | |||||||||
Type | Name | Rate Size Bits | DTR | RTS | |||||||
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1 | RS232 Device A | 9600 8 | 1 | None None | HI | HI | |||||
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| Handshaking |
| 1 |
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| Baud | Rate |
| 2 |
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| Word | Size |
| 3 |
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| Stop | Bits |
| 4 |
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| Parity |
| 5 |
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| RTS Line Driver Inactive State... | 6 |
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| DTR Line Driver Inactive State... | 7 |
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Enter Request :1
Handshaking
For a simple communication between modems three connected lines are needed: TX, Rx, and Ground. For the data to be transmitted, both sides have to be clocking the data at the same baud rate. While this method is sufficient for most applications, it is limited in being able to respond to problems such as the receiver getting overloaded. This is where serial handshaking can help.
Select 1), for the Handshaking menu, Default is None, the Host module responds with the following:
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