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See Also: Null Modem Cables,
DB9 Breakout Board,
DB9 Breadboard Adapters
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.
| Product # |
Description |
Quantity Pricing |
RoHS |
Buy Now |
| 1+ |
10+ |
100+ |
|---|
| MGCNM9FF |
Mini Null Modem Adapter, DB9 Female - DB9 Female |
$2.75 |
$2.49 |
$1.90 |
Yes |
|
| MGCNM9MF |
Mini Null Modem Adapter, DB9 Male - DB9 Female |
$2.75 |
$2.49 |
$1.90 |
Yes |
|
| MGCNM9MM |
Mini Null Modem Adapter, DB9 Male - DB9 Male |
$2.75 |
$2.49 |
$1.90 |
Yes |
|
All of the above items are normally stocked. Please call us if you need to verify availability for a specific quantity, or for pricing at higher quantities. Please visit our ordering page for our ordering policies and a list of ordering methods.
What is RoHS? If you need a RoHS version of a non-RoHS product, please contact us.
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