GadgetPC
ARM9 (AT91SAM9260) based microcontroller system
MGCNM9FFMini Null Modem Adapter, DB9 Female - DB9 Female |
 |
General Description
Use these handy adaptors to join serial devices together. These 'cross over' the transmit, receive, and control lines to allow the RS-232 ports of two PCs to communicate with each other. They can be used in other similar scenarios as well. The compact size of these adapters makes them ideal for tight spaces. These are available as Female-Female, Male-Female, and Male-Male adapters. In all cases, the pin mapping is as follows:
| Signal | DB9 Pin | DB9 Pin | Signal |
|---|---|---|---|
| Receive | 2 | 3 | Transmit |
| Transmit | 3 | 2 | Receive |
| DTR (Data Terminal Ready) | 4 | 6, 1 | DSR (Data Set Ready), Carrier Detect |
| Ground | 5 | 5 | Ground |
| DSR (Data Set Ready), Carrier Detect | 6, 1 | 4 | DTR (Data Terminal Ready) |
| RTS (Request to Send) | 7 | 8 | CTS (Clear to Send) |
| CTS (Clear to Send) | 8 | 7 | RTS (Request to Send) |
Pin 9 is not connected on either side.
