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Chapter 6: Connector Pin Assignments

The popular 9-pin D subminiature connector is used for interfacing to communication lines. The
connector is equipped with 4-40 threaded standoffs (female screw lock) to provide strain relief.

Pin No.

Assignment

(Receive Data)

(Transmit Data)

GND (Signal Ground)

(Receive Data)

Table 6-1:

Connector Pin Assignments

Data Cable Wiring

The following table shows pin connections between two devices for Simplex, Half -Duplex and Full-
Duplex operations.

Mode

Card 1

Card 2

Rx+ pin 9

Tx+ pin 2

Simplex, 2-wire, receive only,

RS422

Rx- pin 1

Tx- pin 3

Tx+ pin 2

Rx+ pin 9

Simplex, 2-wire, transmit only,

RS422

Tx- pin 3

Rx- pin 1

Tx+ pin 2

Half-Duplex, 2-wire, RS485

Tx- pin 3

Tx+ pin 2

Rx+ pin 9

Tx- pin 3

Rx- pin 1

Rx+ pin 9

Tx+ pin 2

Full-Duplex, 4-wire, RS422

Rx- pin 1

Tx- pin 3

Manual PCI-COM-1S

Содержание LPCI-COM-1S

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Страница 5: ...Address Selection 12 Chapter 5 Programming 13 Initialization 14 Table 5 1 Baud Rate Divisor Values 14 Chapter 6 Connector Pin Assignments 17 Table 6 1 Connector Pin Assignments 17 Appendix A Applicati...

Страница 6: ...biased please contact the factory COM Port Compatibility A 16550 UART is used as the Asynchronous Communication Element ACE It includes 16 byte transmit receive FIFO buffers to protect against lost d...

Страница 7: ...yle connector compatible with RS422 and RS485 specifications Character length 5 6 7 or 8 bits Parity Even odd or none Stop Interval 1 1 5 or 2 bits Serial Data Rates Up to 115 200 baud Asynchronous Fa...

Страница 8: ...TRANSCEIVER AUTO RTS CIRCUITRY OSCILLATOR PCI INTERFACE CHIP UART 16550 OR SIMILAR CO MPUTER PCI BUS DB9M Tx Rx Tx Rx RS485 MODE ONLY Tx Rx IRQ Figure 1 1 Block Diagram Manual PCI COM 1S 7...

Страница 9: ...tallation The following instructions assume the CD ROM drive is drive D Please substitute the appropriate drive letter for your system as necessary DOS 1 Place the CD into your CD ROM drive 2 Type B t...

Страница 10: ...uter cover and turn ON the computer Enter the CMOS setup program of your system and verify that the PCI plug and play option is set appropriately for your system Systems running Windows 95 98 2000 XP...

Страница 11: ...85 operations where there are multiple terminals only the RS485 ports at each end of the network should have terminating resistors as described above Also for RS485 operation there must be a bias on t...

Страница 12: ...TERMOUT 485 422 TERMIN X4 X1 4 80 1 80 Figure 3 1 Option Selection Map Manual PCI COM 1S 11...

Страница 13: ...any allotted Alternately some operating systems Windows 95 98 2000 can be queried to determine which resources were assigned In these operating systems you can use either PCIFind or the Device Manager...

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Страница 15: ...4000 ft 1200 96 384 4000 ft Recommended maximum distances for differentially driven data cables RS422 or RS485 are for typical conditions Table 5 1 Baud Rate Divisor Values In C the code to set the ch...

Страница 16: ...driven communications should be used whenever possible and is required for high data rates Writing an interrupt driven receiver is not much more complex than writing a polled receiver but care should...

Страница 17: ...t is high the transmitter has sent the data The process of checking the bit until it goes high followed by a write is repeated until no data remains After all data has been transmitted the RTS bit sho...

Страница 18: ...9 Rx Receive Data Table 6 1 Connector Pin Assignments Data Cable Wiring The following table shows pin connections between two devices for Simplex Half Duplex and Full Duplex operations Mode Card 1 Ca...

Страница 19: ...ve Balanced Differential Signals The reason that RS422 and RS485 devices can drive longer lines with more noise immunity than RS232 devices is that a balanced differential drive method is used In a ba...

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