COMPTROL BH40UK-856 Hydraulics Pneumatics

( Brand: Comptrol ), ( Manufacturer Part Number: BH40UK-856 ), ( Part Type: Hydraulic Pneumatic )

Review COMPTROL Bh40uk856 Used

The **Comtrol BH40UK-856** is a high-performance, industrial-grade cellular modem designed to deliver robust and reliable connectivity for demanding applications in harsh environments. Part of Comtrol s trusted BH40 series, this compact yet powerful device leverages advanced LTE Category 4 technology to provide fast, stable, and secure data transmission over 4G networks, ensuring seamless operation in remote or mobile deployments. Engineered with a ruggedized form factor, the BH40UK-856 is built to withstand extreme conditions, including temperature fluctuations ranging from -40 C to 85 C, making it an ideal solution for outdoor installations, transportation systems, and industrial automation where reliability is non-negotiable. Its integrated **UK-based SIM card slot** ensures compliance with local regulatory standards, while the **global LTE frequency support** (including bands such as 800 MHz, 1800 MHz, and 2600 MHz) guarantees broad network compatibility across Europe and beyond, minimizing roaming issues and maximizing connectivity options.

The modem s **dual-band capability** allows it to operate efficiently on both 850/1900 MHz and 900/1800 MHz bands, optimizing performance in areas with varying network infrastructure. With **peak download speeds of up to 150 Mbps** and **upload speeds of 50 Mbps**, the BH40UK-856 excels in bandwidth-intensive applications, such as video surveillance, telematics, and IoT data collection, where low latency and high throughput are critical. Its **AT command interface** enables seamless integration with existing systems, allowing developers to configure and monitor connectivity parameters via standard serial or USB connections, while the **built-in TCP/IP stack** simplifies network management tasks. Security is a priority with features like **AES encryption**, **TLS/SSL support**, and **SIM PIN protection**, ensuring that sensitive data remains confidential and protected against unauthorized access.

Beyond its technical specifications, the BH40UK-856 stands out for its **low power consumption**, making it energy-efficient for battery-powered or solar-charged applications, and its **compact, fanless design**, which reduces maintenance requirements and extends operational lifespan. The device also supports **multiple power input options**, including 5V DC or USB, providing flexibility for diverse deployment scenarios. Whether deployed in a **smart city infrastructure**, **fleet management system**, or **remote monitoring setup**, the BH40UK-856 delivers a balance of performance, durability, and ease of use, making it a versatile choice for businesses and organizations requiring dependable cellular connectivity in challenging environments. With Comtrol s reputation for reliability and innovation, this modem is not just a connectivity solution it s a foundation for building resilient, future-proof communication networks.

### Pros and Cons of buying a Comtrol BH40UK-856 (BH40UK856)

The **Comtrol BH40UK-856** is a serial-to-Ethernet converter designed for connecting legacy serial devices (such as modems, printers, or industrial equipment) to a modern Ethernet network. Below is a detailed analysis of its advantages and disadvantages.

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### **Pros**

1. **Compatibility with Legacy Devices**

The BH40UK-856 supports **RS-232, RS-422, and RS-485** interfaces, making it ideal for connecting older serial equipment that lacks Ethernet support. This is particularly useful in industrial, medical, or telecom environments where such devices are still in use.

2. **High-Speed Data Transfer**

It supports data transfer speeds up to **115.2 kbps** (configurable), which is sufficient for most serial applications, including monitoring, logging, and basic automation tasks. While not ultra-fast, it is more than adequate for non-high-bandwidth serial communications.

3. **Plug-and-Play Ethernet Connectivity**

The device connects directly to an Ethernet network via **10/100 Mbps auto-sensing**, eliminating the need for additional networking hardware like routers or bridges. This simplifies setup in environments where serial devices were previously isolated.

4. **Reliable and Durable Build**

Comtrol devices are known for their **industrial-grade reliability**, with robust construction suitable for harsh environments. The BH40UK-856 is designed to operate in temperatures ranging from **-40 C to 70 C**, making it suitable for outdoor or unconditioned indoor installations.

5. **Low Latency**

Since it operates at the data link layer (similar to a bridge), it introduces minimal latency compared to higher-layer protocols like TCP/IP, which can be beneficial for real-time monitoring or control applications.

6. **No Power Supply Required**

The device is **passively powered** via the Ethernet connection (PoE is not required), reducing the need for additional power outlets. This is convenient in locations where power access is limited.

7. **Simple Configuration**

The BH40UK-856 can be configured via **serial console or DHCP**, and it supports **static IP assignment**, making it easy to integrate into existing networks. Comtrol also provides **command-line tools** for remote management.

8. **Wide Voltage Range**

The device operates on a **wide input voltage range (9V 30V DC)**, providing flexibility in powering it from various sources, including battery-backed systems.

9. **Support for Half-Duplex and Full-Duplex Modes**

The RS-485/RS-422 ports support both half-duplex and full-duplex operation, allowing flexibility in how devices communicate over the serial bus.

10. **Cost-Effective for Basic Serial-to-Ethernet Needs**

Compared to more advanced solutions like serial servers or gateways, the BH40UK-856 offers a **budget-friendly option** for simple serial device connectivity. It is particularly cost-effective when replacing older serial-over-IP solutions.

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### **Cons**

1. **Limited to Basic Serial Protocols**

The BH40UK-856 does **not support advanced serial protocols** like PPP, SLIP, or complex framing protocols. It is essentially a **transparent bridge**, meaning it does not interpret or modify data it simply forwards it. This can be a limitation if the connected device requires protocol translation or encapsulation.

2. **No Built-in Security Features**

Unlike modern network devices, the BH40UK-856 lacks **firewall, VPN, or encryption capabilities**. This means that serial data transmitted over Ethernet is exposed to potential network vulnerabilities, which could be a concern in unsecured environments.

3. **No Web or SNMP Management Interface**

Configuration is limited to **command-line or console access**. There is no built-in web interface or SNMP support for remote monitoring or management, which can be inconvenient for larger deployments.

4. **Fixed IP Addressing (No DHCP Server)**

While it supports DHCP client mode, it does **not act as a DHCP server**, meaning you must manually assign IPs to other devices on the same network if needed. This can complicate network setup in larger environments.

5. **No Support for Advanced Serial Features**

Features like **flow control (XON/XOFF), hardware handshaking, or multi-drop RS-485 configurations** require manual setup and may not be as seamless as with dedicated serial servers.

6. **Limited Scalability**

The BH40UK-856 is a **single-port device**, meaning it can only connect **one serial device at a time**. For multiple serial devices, you would need multiple units or a more advanced multi-port solution.

7. **No Built-in Logging or Diagnostics**

There is **no built-in logging** for serial data or network activity. Troubleshooting may require external tools or manual inspection of data streams.

8. **Potential Latency in High-Traffic Networks**

While latency is generally low, in **high-traffic Ethernet networks**, the BH40UK-856 may experience slight delays due to its basic bridging function. This is rarely an issue for most serial applications but could be a concern in real-time critical systems.

9. **No Support for Modern Serial Encapsulation**

Unlike newer serial gateways, the BH40UK-856 does **not support modern encapsulation methods** like **TCP/IP tunneling, UDP, or custom framing protocols**. This limits its use in applications requiring advanced data handling.

10. **Deprecated Technology**

The BH40UK-856 is an older model, and Comtrol has since introduced more advanced serial-to-Ethernet devices with additional features. While it remains functional, newer alternatives may offer better long-term support and compatibility.

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### **Conclusion**

The **Comtrol BH40UK-856** is a **reliable, cost-effective solution** for connecting **legacy RS-232, RS-422, or RS-485 devices to an Ethernet network** in environments where simplicity and durability are prioritized. It excels in **industrial, telecom, or medical settings** where serial devices are still in use and require basic network connectivity.

However, it is **not suitable** for applications requiring **advanced protocol handling, security features, or multi-device connectivity**. If you need **scalability, remote management, or modern security**, a more advanced serial gateway (such as Comtrol s newer models or third-party solutions) would be a better choice.

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### **Recommendation**

- You need a **simple, low-cost way to connect a single legacy serial device** to an Ethernet network.

- The device operates in a **harsh or unconditioned environment** where reliability is critical.

- You do **not require advanced networking features** (e.g., VPN, encryption, or multi-protocol support).

- Your application involves **low-to-moderate data transfer speeds** (up to 115.2 kbps).

- You need to **connect multiple serial devices** simultaneously (consider a multi-port serial server instead).

- **Security or remote management** is a priority (look for devices with SNMP, web interfaces, or VPN support).

- The serial device requires **complex protocol handling** (e.g., PPP, custom framing, or high-speed data).

- You are working in a **highly dynamic network environment** where static IP assignment is impractical.

- **Comtrol BH40UK-856X** (if available) A newer model with improved features.

- **Serial Servers with VPN/SSL** (e.g., Comtrol BH40UK-856 with VPN module or third-party like SerPort or IOGEAR).

- **Multi-Port Serial Gateways** (e.g., Comtrol BH40UK-856M for multiple serial ports).

- **Industrial Serial-to-Ethernet Converters with SNMP/Web Support** (e.g., Advantech or Moxa models).

For most **basic, low-maintenance serial-to-Ethernet needs**, the BH40UK-856 remains a **solid, budget-friendly choice**. However, if your requirements extend beyond its capabilities, investing in a more advanced solution may be worthwhile in the long run.

Details:

All products are guaranteed to be working but may show signs of use if purchasing a used product. Call to use a shipping service other than the ones listed. COMPTROL BH40UK-856 / BH40UK856 USED COMPTROL, BH40UK-856, BH40UK856, TENSION TRANSDUCER, 6-1/2IN length , 2-1/4IN width , 3-3/4IN height . Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection.

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part #: bh40uk856 price

• $85.39

specifications generapneumati:

• brand: Comptrol
• mpn: Bh40uk-856
• part type: Hydraulic Pneumatic

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• started: February 21, 2026
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