Interfacing the GPIB-RS232 to a DTE with Handshaking
- Updated2024-03-18
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Interfacing the GPIB-RS232 to a DTE with Handshaking
For serial devices set up as DTEs, you must wire a DTE-to-DTE interface cable, commonly known as a null modem cable. The cable allows the GPIB-RS232 to act as if it is communicating with a DCE, but it swaps the appropriate pins to achieve a DTE configuration. This wiring configuration is shown in the following table.
Cable Wiring Scheme for GPIB-RS232 DTE to Serial Device DTE
| GPIB-RS232 Signal to DTE Serial Device Signal |
Standard DTE to DTE 9-pin 9-pin |
Standard DTE to DTE 9-pin 25-pin |
|---|---|---|
| RXD to TXD1 | 2 to 3 | 2 to 2 |
| TXD to RXD1 | 3 to 2 | 3 to 3 |
| DTR to DSR | 4 to 6 | 4 to 6 |
| GND to GND1 | 5 to 5 | 5 to 7 |
| RTS to CTS | 7 to 8 | 7 to 5 |
| CTS to RTS | 8 to 7 | 8 to 4 |
| 1The connections must be implemented. | ||
The following figure shows a typical 9-pin to 9-pin null modem cable with the RTS, CTS, and DTR handshake lines implemented. This cable configuration allows you to connect to the 9-pin serial port of a personal computer.
The following figure shows an equivalent 9-pin DTE to 25-pin DTE cable configuration. The cable in this figure shows how to connect to the 25-pin serial port of a personal computer.
