When you need to extend RS232 serial connections over standard network cables, reliable adapters are essential. This article highlights five practical RS232-to-Ethernet solutions that work with DB9 connectors, offering clear port mappings, bidirectional data flow, and simple, cost-effective setups for long-distance serial communications. Each option supports CAT5/6 cables and delivers straightforward compatibility with common RS232 devices. Read on to compare key features, deployment notes, and what to consider before buying.
| Product | Brand | Connection Type | Cable Distance | Notes |
|---|---|---|---|---|
| DTECH DB9 to RJ45 Serial Adapter RS232 Female to RJ-45 Female Ethernet Converter | DTECH | DB9 Female to RJ45 Female | Up to 65 ft | RS232 over Cat5/6, simple extension |
| DTECH DB9 to RJ45 Serial Adapter RS232 Male to RJ-45 Female | DTECH | DB9 Male to RJ45 Female | Up to 65 ft | Straight-through pinout, cost-effective |
| DTECH RS232 DB9 to RJ45 Serial Adapter (2 Pack) | DTECH | DB9 to RJ45 | Up to 65 ft | Value pack for dual devices |
| DB9 RS232 to RJ45 Extender (2-Pack) | XMSJSIY | DB9 to RJ45 | Up to 66 ft | No external power, robust build |
| ANMBEST 10PCS DB9 Male Ethernet Adapter | ANMBEST | DB9 Male to RJ45 | Up to 100 ft | Bulk pack for multiple devices |
The following sections provide detailed product insights to help you choose the right RS232-to-Ethernet solution for your environment—whether you’re wiring a lab, workshop, or industrial installation.
DTECH DB9 to RJ45 Serial Adapter — RS232 Female to RJ45
Overview: This DB9 female to RJ45 female adapter provides a simple, cost-effective way to move RS232 data over inexpensive CAT5/CAT6 cables. It converts a DB9 female connector into an RJ45 female with a straightforward pinout (1-1, 2-2, 3-3, 4-4, 5-5, 6-6, 7-7, 8-8, 9-x). It supports a typical RS232 extension of up to 65 feet when paired with a matching adapter or cable. Ideal for legacy devices that require RS232 over a modern network medium.
Key points:
– Simple RS232 over Ethernet cabling solution
– DB9 female to RJ45 female conversion
– 65-foot extension capability when paired appropriately
– Economical option for multi-device deployments
DTECH DB9 to RJ45 Serial Adapter — RS232 Male to RJ45
Overview: This variant uses a DB9 male connector to RJ45 female adapter, enabling RS232 data transfer over CAT5/CAT6 cable with a straight-through pinout (1-1, 2-2, 3-3, 4-4, 5-5, 6-6, 7-7, 8-8, 9-x). It is a compact, affordable option for extending RS232 serial signals across a standard Ethernet-type cable. Useful when devices are located at a distance but require a simple connector interface change.
Key points:
– DB9 male to RJ45 female configuration
– 65-foot extension capability
– Straight-through RJ45 mapping for ease of use
– Suitable for standard RS232 devices that support DB9
DTECH RS232 DB9 to RJ45 Serial Adapter (2 Pack)
Overview: This 2-pack provides a cost-efficient pair for RS232 to RJ45 extension needs. It converts DB9 connectors into RJ45 jacks with a straight-through pinout, supporting a typical 65-foot reach when used with appropriate cabling. A practical option for applications requiring two adapters for separate devices or redundancy.
Key points:
– Pack of two adapters for value and coverage
– Straight-through DB9 to RJ45 mapping
– Up to 65 feet extension
– Suitable for RS232 devices requiring a simple interface transformation
DB9 RS232 to RJ45 Extender (2-Pack) — 66 ft
Overview: This extender set supports RS232 data transmission over RJ45 networks with no external power requirement. It applies a DB9 to RJ45 conversion with a robust build suitable for longer runs, claiming up to around 66 feet. The kit is designed for desktop and industrial contexts where a reliable, passive extension is sufficient.
Key points:
– Passive extender with no power needed
– Up to approximately 66 feet
– Durable RJ45 interfacing and DB9 mapping
– Useful for environments requiring sturdy, no-fuss serial extension
ANMBEST 10PCS DB9 Male Ethernet Adapter
Overview: This bulk package targets larger deployments or labs needing multiple RS232-to-Ethernet conversions. It converts DB9 male connectors to RJ45 on IEEE-style Ethernet cables, with a distance reach up to 100 feet in typical setups. It provides a scalable option for environments that require many adapters for ongoing projects or installations.
Key points:
– Bulk pack of 10 adapters
– DB9 male to RJ45 conversion
– Extended reach up to 100 feet under suitable conditions
– Suitable for multi-device environments and setups that require redundancy
Buying Guide: Key Purchase Considerations For RS232 To Ethernet Adapters
When selecting RS232-to-Ethernet adapters, consider the following factors to ensure compatibility and reliable operation:
- Connector types and pinouts: Confirm the DB9 gender (male or female) and the RJ45 mapping to ensure correct compatibility with your devices.
- Maximum transmission distance: Most extenders specify a practical range (often around 65–66 feet); evaluate your layout to prevent signal degradation.
- Power requirements: Many passive adapters require no external power, but some extended configurations might benefit from powered options for longer runs.
- Copper vs. shielding: Look for sturdy materials and shielded RJ45 interfaces if you operate in electrically noisy environments.
- Quantity and scalability: Bulk packs are useful for labs or industrial installations; plan for future needs to avoid mix-and-match issues.
- Durability and strain relief: Durable connectors with molded strain relief reduce wear in frequent plug/unplug cycles.
- Deployment scenario: Consider whether you need one-to-one adapters, pairs for bidirectional signaling, or multiple adapters for networked devices.
- Cable quality: Use high-quality CAT5/5e/6 cables with intact connectors to maintain signal integrity over distance.