Product Description
AD-D9M-SLB - Serial Loopback Plug
The AD-D9M-SLB Serial Loopback Plug is a passive DB9 Male RS-232 loopback tester designed for testing, troubleshooting, and verifying 9-pin serial communication ports. Simply plug the loopback into a DB9 female serial port to create an internal connection between transmit and receive signals, allowing technicians and software to test serial communication without connecting an external device.
Features
- Part Number: AD-D9M-SLB
- Connector: DB9 Male, 9-pin D-Sub
- Interface: RS-232 Serial
- Design: Passive loopback plug
- No external power required
- Compact design for convenient field and bench testing
- Ideal for serial-port diagnostics and troubleshooting
- Provides quick verification of transmit/receive signal paths
Loopback Connections
The AD-D9M-SLB uses internal connections to loop selected RS-232 signals back to the serial port:
1-4 | 6-9
2-3 | 7-8
These connections allow compatible serial test software and diagnostic equipment to verify signal continuity and communication pathways.
Applications
Perfect for:
- RS-232 serial port testing
- Computer and equipment diagnostics
- Field service troubleshooting
- Bench testing and repair
- Manufacturing quality control
- Serial-port continuity testing
- Equipment installation and maintenance
- Troubleshooting legacy communications equipment
How It Works
The loopback plug connects directly to a DB9 Female RS-232 port. Its internal wiring routes transmitted signals back to the appropriate receiving inputs, allowing diagnostic software or test equipment to determine whether the serial port is functioning properly.
Because the AD-D9M-SLB is passive, it contains no active electronics and requires no external power supply.
American Radio Supply – AD-D9M-SLB
A simple, reliable tool for RS-232 serial port testing, diagnostics, and service.
