Reliable Surge Protection for RS232 Serial Communication Lines
LY11 is an inline serial communication surge protector designed for RS232 equipment using DB9 or DB25 connectors. It provides line-to-line and line-to-ground transient protection for industrial controllers, computers, modems, telemetry equipment, access-control systems, and other serial communication devices.
Designed for RS232 serial communication ports
Available with DB9 and DB25 connector options
Up to 1Mbps transmission with ≤0.2dB insertion loss
Fast response time of no more than 10ns
Suitable Applications
LY11 is suitable for equipment that communicates through DB9 or DB25 RS232 serial ports and requires protection against induced transient overvoltage.
Industrial Controllers
Protects RS232 ports on PLCs, controllers, industrial computers, and machine interfaces.
Telemetry Equipment
Suitable for telemetry, remote sensing, remote-control, and data-acquisition equipment.
Modems & Serial Servers
Helps protect serial modems, protocol converters, terminal servers, and communication gateways.
Access Control Systems
Protects serial communication ports used by access control, security, monitoring, and alarm systems.
FAQ
Common questions about LY11 DB9 and DB25 RS232 signal surge protector selection and installation.
What is the LY11 RS232 surge protector used for?
LY11 is installed inline with an RS232 serial connection to help prevent transient overvoltage from reaching computers, controllers, modems, telemetry equipment, and other serial communication devices.
What is the difference between the DB9 and DB25 versions?
The DB9 version is designed for equipment using a 9-pin serial connector, while the DB25 version is intended for 25-pin serial interfaces. Select the version that matches the protected equipment and pin arrangement.
Will LY11 affect RS232 communication?
The listed maximum transmission rate is 1Mbps and the insertion loss is no more than 0.2dB. The actual baud rate, pin assignment, cable length, and equipment compatibility should still be confirmed.
Does LY11 provide line-to-ground protection?
The product description identifies both line-to-line and line-to-ground surge protection. The grounding path must be short and connected according to the installation instructions.
How should LY11 be installed?
Connect the protector inline between the incoming serial cable and the protected equipment. Match the DB9 or DB25 connector direction and keep the grounding path as short and direct as possible.
What should be confirmed before ordering?
Confirm whether DB9 or DB25 is required, the serial protocol, operating voltage, connector gender, protected pin assignment, baud rate, cable length, grounding method, and installation direction.
