A null modem serial cable (frequently called a crossover cable) is used to connect two DTE devices together without the use of a DCE device in between. For this to happen the Transmit (TXD) and Receive (RXD) pins on one of the serial connectors are flipped. Null modem is a communication method to directly connect two DTEs using an RS-232 serial cable. The name stems from the historical use of RS-232 cables to connect two teleprinter devices or two modems.
Specifications
Specifications
- Null-Modem terminations
- Pin-Outs: 1 - 4&5 2 - 2 3 - 3 4 - 6 5 - 7 6 - 20 7&8 - 8 9 - 22 G G
- Connector A: DB9 FEMALE Connector B: DB25 MALE
- Cable Construction: PVC 45Pa Ivory
- Nickel Plated conductors
- Cable Spec: 30AWG
