Comprehensive Product Summary – EMC-7485 Ethernet to RS485 Isolated 8 TTL Module

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### 1. Product Overview

Product Name: Ethernet to RS485 Isolated 8 TTL Module
Model: EMC-7485
Series: EMC74xx Series (includes EMC7432 and EMC7485 variants)
Article Number: EMC-7485
Manufacturer: JS Automation Corp. (健昇科技股份有限公司)
Manufacturer Address: 6F, No.100, Chungshin Rd., Shitsu, Taipei, Taiwan, R.O.C.
Website: [http://www.automation.com.tw](http://www.automation.com.tw)
Contact: control.cards@automation.com.tw | Tel: +886-2-2647-6936 | Fax: +886-2-2647-6940

The EMC-7485 is an industrial-grade Ethernet-to-serial converter module designed to bridge Ethernet networks with RS422/RS485 serial communication systems. It integrates 8 channels of TTL digital I/O with isolation and counter functionality, providing a versatile interface for industrial automation, remote monitoring, and control applications. The module supports DIN rail mounting, operates on 12–24 VDC, and features software-selectable RS422/RS485 modes.

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### 2. Key Features

- Ethernet to RS422/RS485 Conversion: Converts traditional serial communication protocols to Ethernet and vice versa, enabling network-based control of serial devices.
- 8 TTL Digital I/O Channels: Configurable as input or output, each channel supports up to 60 VDC over-voltage protection and 50 mA current protection.
- Integrated Counter Function: Each TTL input can function as a low-frequency counter (up to 200 Hz square wave).
- Electrical Isolation: Provides isolation between Ethernet, RS485, and TTL interfaces for enhanced noise immunity and system protection.
- Auto-Detect Ethernet Interface: Supports 10/100 Mbps auto-switching for flexible network integration.
- Software-Selectable Serial Mode: RS422 or RS485 mode can be configured via software commands.
- PTC Protection: Auto-resettable fuse protection on TTL I/O and communication signal pins.
- Remote Configuration: IP address and communication port can be reassigned remotely.
- Virtual COM Port Support: Allows the module to appear as a standard COM port on Windows systems for legacy software compatibility.
- Compact Industrial Design: DIN rail mountable, rugged enclosure suitable for industrial environments.
- Comprehensive Software Library: Includes DLL-based API for Windows (EMC74xx.dll) supporting C/C++, Visual Basic, and Borland environments.

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### 3. Technical Specifications

Ethernet Interface:
- Speed: 10/100 Mbps auto-switching
- Protocol: TCP/IP socket-based communication
- Default IP: 192.168.0.100
- Default Remote Port: 6936
- Default Host Port: 25122

RS422/RS485 Interface:
- Baud Rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 921600 bps
- Data Bits: 5, 6, 7, 8
- Stop Bits: 1, 1.5, 2
- Parity: None, Even, Odd
- Flow Control: Xon/Xoff, Hardware, None
- Mode: RS422 (default) or RS485 (software selectable)
- Connector: JM3 terminal block
- Signal Pins: TXD+, TXD-, RXD+, RXD-, EXTG (ground reference)

TTL I/O Interface:
- Channels: 8 (TTL0–TTL7)
- Logic High Input: ≥ 2.0 V
- Logic Low Input: ≤ 0.4 V
- Logic High Output: ≥ 2.4 V @ 8 mA
- Logic Low Output: ≤ 0.4 V @ 8 mA
- Over-voltage Protection: 60 VDC (max)
- Over-current Protection: 50 mA (max)
- Counter Speed: 200 Hz (max, square wave)
- Connector: JM1 10-pin terminal block
- Pinout: TTL0–TTL7, GND

Power & Environmental:
- Supply Voltage: 12–24 VDC
- Power Connector: JM4 terminal block
- Operating Temperature: 0°C to +70°C
- Storage Temperature: -20°C to +80°C
- Humidity: 5–95% RH (non-condensing)
- Dimensions: 89 mm (D) × 110 mm (W) × 34 mm (H)
- Weight: Approx. 200 g (typical)
- Mounting: DIN rail

Indicators & Controls:
- LED1: System active indicator
- SW2: System reset switch

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### 4. Functionality

The EMC-7485 functions as a bidirectional Ethernet-to-serial converter with integrated digital I/O and counter capabilities. It enables remote devices using RS422 or RS485 communication to be accessed over Ethernet networks. The module’s internal microcontroller manages data translation between Ethernet packets and serial data streams.

Use Cases & Applications:
- Industrial automation and process control
- Remote data acquisition and monitoring
- Machine-to-machine (M2M) communication
- SCADA systems and PLC integration
- Remote sensor and actuator control via Ethernet
- Legacy serial device networking

Compatibility:
- Compatible with Windows 2000 and later operating systems
- Supports integration with C/C++, Visual Basic, and Borland C++ Builder environments
- Works with JS Automation’s EMC74xx.dll library for API-level control
- Supports virtual COM port emulation for legacy software

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### 5. Components & Accessories

Included Components:
- EMC-7485 Ethernet to RS485 isolated 8 TTL module
- Software package (driver, DLL, demo programs)
- User and software manuals (PDF)

Connectors:
- J1: RJ45 Ethernet port
- JM1: 10-pin TTL I/O terminal block
- JM3: RS422/RS485 terminal block
- JM4: Power input terminal (12–24 VDC)

Optional Accessories:
- JD52000: 110/220 VAC to 24 VDC @ 1.5A power supply
- JD52026: 110/220 VAC to 24 VDC @ 0.75A power adapter

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### 6. Installation & Setup

Hardware Installation:
1. Mount the EMC-7485 on a DIN rail.
2. Connect the power supply (12–24 VDC) to JM4.
3. Connect Ethernet cable to J1 (RJ45).
4. Connect RS422/RS485 lines to JM3 according to pin definitions.
5. Connect TTL I/O signals to JM1 as required.
6. Ensure EXTG (external ground) is connected between communication devices for noise immunity.

Software Installation:
- Run `EMC74xx_Install.exe` to install drivers, API, and demo programs.
- Default installation path: `..\JS Automation\EMC74xx\`
- Includes subdirectories for API, Driver, and Executables.
- DLL file: `EMC74xx.dll` (installed in system directory).

Configuration:
- Use `EMC74xx_Initial()` to map IP and port to a CardID.
- Modify IP or port using `EMC74xx_IP_change()` and `EMC74xx_socket_port_change()`.
- Reboot module with `EMC74xx_reboot()` after configuration changes.
- Configure serial parameters using `EMC74xx_serial_port_set()`.
- Set TTL I/O direction and values using `EMC74xx_port_config_set()` and `EMC74xx_port_set()`.

Virtual COM Port Setup:
- Install virtual COM port using `EMC74xx_VSPM_install()`.
- Assign IP using `EMC74xx_VSPM_set()`.
- Connect using `EMC74xx_VSPM_connect()`.
- Remove or close using `EMC74xx_VSPM_remove()` and `EMC74xx_VSPM_close()`.

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### 7. Performance & Capabilities

Communication Performance:
- Ethernet throughput supports real-time serial data transmission.
- Serial baud rates up to 921,600 bps ensure compatibility with high-speed devices.
- Low latency communication suitable for industrial control loops.

TTL I/O Performance:
- Each TTL channel can operate as input or output.
- Counter function supports up to 200 Hz input frequency.
- TTL I/O protected against over-voltage and over-current conditions.

Reliability & Protection:
- PTC resettable fuses protect against short circuits and surges.
- Electrical isolation between communication interfaces enhances system robustness.
- Auto-recovery after fault conditions.

Limitations:
- Counter frequency limited to 200 Hz (not suitable for high-speed pulse counting).
- Operating temperature limited to +70°C (requires ventilation in high-heat environments).

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### 8. Standards & Compliance

Electrical & Safety:
- Designed for industrial automation environments with isolation and protection features.
- PTC protection ensures compliance with industrial safety standards for I/O protection.

Communication Standards:
- Ethernet IEEE 802.3 (10/100Base-T)
- RS422/RS485 serial communication standards
- TTL logic levels compliant with standard 5V digital logic

Software & System Compatibility:
- Windows 2000 and later
- Supports standard TCP/IP networking
- Compatible with major programming environments supporting Windows DLLs

Regulatory Compliance:
- CE and FCC compliance (typical for JS Automation industrial modules)
- RoHS-compliant manufacturing

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### 9. Additional Information

Warranty:
- Standard manufacturer warranty (typically 1 year, subject to JS Automation policy).

Technical Support:
- JS Automation provides email and online support.
- Documentation and software updates available at [www.automation.com.tw](http://www.automation.com.tw).

Maintenance:
- No periodic maintenance required beyond ensuring clean electrical connections.
- Firmware updates can be applied via Ethernet interface.

Software Updates:
- Latest drivers, DLLs, and demo programs downloadable from manufacturer’s website.
- Version 1.0 firmware and EMC74xx.dll v1.0 are current as per documentation.

Error Handling:
- Comprehensive error code system (0–334) for diagnostics, including socket errors, IP configuration errors, and communication timeouts.
- Example:
- `INITIAL_SOCKET_ERROR (1)` – Ethernet hardware problem
- `IP_ADDRESS_ERROR (2)` – Invalid IP address
- `COUNTER_READ_ERROR (316)` – Counter data read failure

Security Features:
- Password protection for configuration changes.
- Default password: “12345678”.
- Functions for password change, reset, and security unlock.

Software Development Support:
- API functions for initialization, configuration, I/O control, counter management, and virtual COM operations.
- Supported languages: Microsoft Visual C/C++, Borland C/C++, Visual Basic.
- Header and library files: `EMC74xx.h`, `EMC74xxVC.lib`, `EMC74xxBC.lib`, `EMC74xx.bas`.

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### Summary

The JS Automation EMC-7485 Ethernet to RS485 Isolated 8 TTL Module is a robust, feature-rich industrial communication interface designed for integrating serial devices into Ethernet networks. With its dual RS422/RS485 capability, 8-channel TTL I/O, and software-configurable parameters, it provides a flexible solution for automation engineers and system integrators. The module’s isolation, protection, and counter features make it ideal for demanding industrial environments requiring reliable, remote, and secure data communication.

Its comprehensive software library, virtual COM port support, and broad programming compatibility ensure seamless integration into existing systems, while its compact DIN-rail design and 12–24 VDC operation make it suitable for a wide range of industrial control panels and embedded applications.