We will arrange delivery within 3-5 days after receiving the payment.

Our express delivery: DHL and FedEx.

Quality packing for each product

Destination country all taxes & duty to be paid by buyer

Only part of the brand and model, if you have other product needs, please contact us.

Bachmann EM203 Serial to Ethernet Module

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Bidirectional Serial-to-Ethernet Conversion

• Protocol Translation: Converts data between serial and Ethernet protocols without user programming. For example:
  • Translates Modbus RTU data from a legacy RS-485 pressure sensor into Modbus TCP/IP for transmission to an Ethernet SCADA system.
  • Converts ASCII commands from an Ethernet HMI into serial signals for a vintage RS-232 temperature controller.
• Dual Serial Port Flexibility: The two configurable RS-232/RS-485 ports support mixed serial devices—e.g., Port 1 connects to an RS-232 barcode scanner, while Port 2 links to an RS-485 network of 8 Modbus RTU flow meters—maximizing compatibility with diverse legacy equipment.

3.2 Industrial-Grade Reliability

• EMI Immunity & Isolation: 2.5kV AC isolation on serial ports and 1kV AC isolation on Ethernet protects the module and connected devices from ground loops, voltage spikes, and electrical noise (common in factories with motors or welders). Differential signaling for RS-485 further enhances noise resistance, ensuring stable communication over long cable runs (up to 1200m for RS-485).
• Connection Persistence: Automatically re-establishes TCP/UDP connections if the Ethernet link is temporarily disrupted (e.g., cable disconnection). Serial data is buffered (configurable buffer size: 1kB ~ 32kB) during outages, preventing data loss when communication resumes—critical for time-sensitive processes like batch manufacturing.

3.3 Flexible Network Configuration

• IP Management: Supports both static IP (for fixed network assignments) and DHCP (for dynamic IP allocation), adapting to diverse industrial network setups. Users can configure IP settings via Bachmann M1 Configurator or a web-based management interface (optional), simplifying deployment.
• Modbus Master/Slave Modes: For Modbus protocols, the EM203 can act as a Modbus RTU master (polling serial slave devices) or slave (responding to serial master commands), and a Modbus TCP/IP client (sending data to Ethernet masters) or server (receiving Ethernet commands). This flexibility enables integration into existing Modbus networks without reconfiguring other devices.

3.4 Seamless M1 System Integration

• Backplane Communication: Exchanges converted data with the M1 CPU via the M1 backplane’s high-speed bus (100 Mbps), ensuring low-latency (<1ms) data transfer between the EM203 and the M1 controller. This allows the M1 system to directly monitor or control serial devices via Ethernet, unifying control logic for both legacy and modern equipment.
• Centralized Diagnostics: Transmits real-time status data (e.g., "Serial Port 1: Connected", "Ethernet: Disconnected", "Buffer Usage: 20%") to the M1 controller. Alerts trigger for faults like serial parity errors or Ethernet timeouts, enabling remote troubleshooting via M1 HMI or SCADA—reducing the need for on-site visits to legacy equipment.

4. Typical Applications

• Legacy Process Control Retrofit: Connects a 20-year-old RS-485 Modbus RTU process controller (e.g., temperature/ pressure regulator) to a new Ethernet-based M1 automation system. The EM203 converts the controller’s serial data to Modbus TCP/IP, allowing the M1 CPU to monitor process values and send setpoint adjustments.
• Serial Sensor to SCADA Integration: Links 16 RS-485 Modbus RTU level sensors (in a water treatment plant) to a central Ethernet SCADA system. The EM203 acts as a Modbus RTU master to poll sensors and a Modbus TCP/IP client to send data to SCADA, eliminating the need for a separate serial gateway.
• Remote Machinery Monitoring: Enables remote access to an RS-232-based CNC machine’s diagnostic port. The EM203 converts serial diagnostic data to UDP packets, which are transmitted to a cloud-based monitoring platform—allowing technicians to troubleshoot the CNC machine without being on-site.
• Mixed Serial/Ethernet Control: Integrates an RS-232 barcode scanner (for part tracking) and an Ethernet servo drive (for motion control) into a single M1 system. The EM203 converts scanner data to Ethernet, enabling the M1 controller to synchronize part scanning with servo motion.

5. Usage Notes

1. Serial Port Configuration:
   • Match serial parameters (baud rate, parity, data bits) to the connected device—mismatched settings cause garbled data. For example, if a sensor uses 9600 bps, 8 data bits, no parity, 1 stop bit (8N1), configure the EM203’s corresponding port to 8N1.
   • For RS-485, enable the internal 120Ω termination resistor (via M1 Configurator) only if the EM203 is the first or last device in the RS-485 bus—multiple resistors cause signal reflection.
2. Ethernet & Protocol Setup:
   • For Modbus integration, define clear master/slave roles: If the EM203 is a Modbus RTU master, configure polling intervals (100ms ~ 10s) to avoid overwhelming the serial bus. If it’s a Modbus TCP/IP server, set a unique Modbus unit ID to avoid conflicts with other Ethernet devices.
   • Use TCP for reliable data transfer (e.g., control commands) and UDP for high-speed, low-latency data (e.g., real-time sensor readings). Avoid UDP for critical commands, as it does not guarantee packet delivery.
3. Wiring Guidelines:
   • For RS-232: Use shielded cables (0.14–0.5mm²) and limit length to ≤15m to prevent signal degradation.
   • For RS-485: Use twisted-pair shielded cables (0.14–0.5mm²) and limit length to ≤1200m (at 9600 bps). Ground the shield at one end only (preferably at the EM203) to avoid ground loops.
   • For Ethernet: Use CAT5e or higher cables, limit length to ≤100m, and avoid routing alongside high-voltage power cables (e.g., 480V AC) to reduce EMI.
4. Troubleshooting:
   • If serial data is missing: Check for loose connections, mismatched serial parameters, or a full buffer (increase buffer size in M1 Configurator if needed). Use a serial analyzer (e.g., Bachmann M1 Serial Monitor) to verify data transmission.
   • If Ethernet communication fails: Confirm the EM203’s IP address is on the same subnet as the M1 controller/SCADA system. Check the Ethernet link LED (green = active; flashing = data transfer) to diagnose physical layer issues.
5. Maintenance & Environmental Protection:
   • Inspect serial and Ethernet connectors quarterly for corrosion or loose pins—clean with isopropyl alcohol if debris accumulates.
   • Mount the EM203 in a temperature-controlled cabinet (away from heat sources like power supplies) to maintain the -25°C ~ +60°C operating range. In humid environments (e.g., food processing), use a dehumidifier to keep relative humidity <85% (non-condensing) and prevent terminal corrosion

The structure and details of the product：

Please make an inquiry for more models

 Bachmann AIO288/1

 Bachmann ISI222

 Bachmann DIO16-c

 Bachmann RS204

 Bachmann PTAI216

 Bachmann ME203/N

 Bachmann FS211/N

 Bachmann DIO280

 Bachmann DIO248

 Bachmann CS200/N

 Bachmann NT255

 Bachmann MX213

 Bachmann EM203

 Bachmann WT205  

 Bachmann ACR222/2

 Bachmann BS206

 Bachmann DO216

 Bachmann FS211N

 Bachmann FS221/N

 Bachmann FS222/N

 Bachmann ISI202

 Bachmann MC205

 Bachmann MPC270

 Bachmann FS211-N

 Bachmann DO232/DI232

 Bachmann MP226E

 Bachmann AI0288

 Bachmann BS207

 Bachmann BS208

 Bachmann BS209

 Bachmann LM201

 Bachmann SWI205

 Bachmann MPC240

 Bachmann DIO264

 Bachmann AI204/SI

 Bachmann AO202/SI

 Bachmann BS203

 Bachmann CNT204

 Bachmann AIO288

 Bachmann CNT204/H

 Bachmann di232

 Bachmann DIO216

 Bachmann FM211

 Bachmann DIO232

 Bachmann DO232

 Bachmann FS212/N

 Bachmann OT115/R

 Bachmann PATI216

 Bachmann SEM201

 Bachmann BS204

 Bachmann BS205

 Bachmann DIO32-C

 Bachmann DI016-C

 Bachmann BS210

 Bachmann RS204/T

 Bachmann FS212

 Bachmann DPM200

 Bachmann AI0288/1

 Bachmann 00012246-10

 Bachmann 00012245-00

 Bachmann B10467/00

 Bachmann 0001444-00

 Bachmann MX213/CF

 Bachmann BES202

 Bachmann LX800/DD512/CF512/Vx

 Bachmann MP213/E

 Bachmann DMS202

Other best-selling products：