Comprehensive Product Summary – NuDAM ND‑6531 Addressable Isolated Converter Module (RS‑232 to RS‑485/RS‑422)

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### 1. Product Overview

Product Name: NuDAM Addressable Isolated Converter Module
Model Number: ND‑6531
Series: NuDAM‑6000 Series Communication Modules
Article Number: ND‑6531
Manufacturer: ADLINK Technology Inc. (Taiwan)

The ND‑6531 is an industrial‑grade, addressable RS‑422/RS‑485 to RS‑232 converter module designed to integrate legacy RS‑232 devices into modern RS‑485/RS‑422 multi‑drop networks. It provides full electrical isolation, configurable baud rates, and addressable communication control, enabling reliable serial data exchange in distributed automation and data acquisition systems.

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### 2. Key Features

- Bidirectional Conversion: Converts RS‑422/RS‑485 differential signals to standard RS‑232 levels.
- Addressable Operation: Supports both addressable and transparent (non‑addressable) modes for flexible network integration.
- Independent Baud Rate Configuration: RS‑232 and RS‑422/RS‑485 interfaces can operate at different baud rates (1.2 kBd – 115.2 kBd).
- Full‑Duplex and Half‑Duplex Support:
- RS‑422: 4‑wire full‑duplex differential communication.
- RS‑485: 2‑wire half‑duplex differential communication with automatic direction control.
- High Isolation Voltage: 1000 V DC galvanic isolation between communication ports to protect against ground loops and surges.
- Surge Protection: Built‑in transient voltage suppressors (TVS) on RS‑422/RS‑485 lines.
- Auto Direction Flow Control: Automatic transmit/receive switching for RS‑485 half‑duplex operation.
- High‑Speed Data Transfer: Supports up to 115.2 kbps on both interfaces.
- Low Power Consumption: Typical power draw of 1.008 W.
- Industrial‑Grade Design: ABS enclosure with captive mounting hardware, suitable for DIN‑rail or panel installation.
- Software Compatibility: Fully compatible with ND‑6521 and other NuDAM communication modules.
- CE Class A Conformity: Meets industrial EMC and safety standards.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Communication Interfaces | RS‑232 (D‑sub 9 female) ↔ RS‑422/RS‑485 (10‑pin screw terminal) |
| Transmission Speed | 1,200 – 115,200 bps (independent per interface) |
| RS‑232 Signals | TXD, RXD, RTS, CTS, GND |
| RS‑422 Signals | TX+, TX–, RX+, RX– |
| RS‑485 Signals | DATA+, DATA– |
| Isolation Voltage | 1000 V DC between RS‑232 and RS‑422/RS‑485 circuits |
| Power Supply | +10 V DC – +30 V DC (unregulated, reverse‑polarity protected) |
| Power Consumption | 1.008 W (typical) |
| Operating Temperature | –10 °C to +70 °C |
| Storage Temperature | –25 °C to +80 °C |
| Case Material | ABS industrial plastic |
| Mounting | DIN‑rail or panel mount |
| Isolation Type | Opto‑isolation and DC‑DC converter isolation |
| Surge Protection | TVS diodes on RS‑422/RS‑485 lines |
| Compliance | CE Class A, EIA RS‑422/RS‑485 standard |
| Software Compatibility | NuDAM Administration Utility, ND‑6521 command set |

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### 4. Functionality

The ND‑6531 serves as a protocol‑transparent converter between RS‑232 and RS‑422/RS‑485 networks. It allows a host or controller on an RS‑485 bus to communicate with RS‑232 devices such as PLCs, sensors, or controllers.

Operating Modes:
- Addressable Mode: Each ND‑6531 has a unique ID (00–FF hex). The host can selectively communicate with individual converters using ASCII‑based commands.
- Non‑Addressable (Transparent) Mode: Functions as a direct RS‑232↔RS‑485 converter (ND‑6520‑compatible).

Typical Use Cases:
- Integrating RS‑232‑based instruments into RS‑485 fieldbus networks.
- Extending serial communication distances up to 1200 m (4000 ft).
- Multi‑drop data acquisition systems (up to 128 devices per bus).
- Industrial automation, SCADA, and remote monitoring.

Compatibility:
- Works with all NuDAM‑6000 modules (ND‑601x, 602x, 605x, 606x, 6080).
- Compatible with standard PC COM ports, PLC serial ports, and industrial controllers.

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### 5. Components & Accessories

Included:
- ND‑6531 converter module (ABS enclosure).
- 10‑pin plug‑in screw terminal block for RS‑422/RS‑485 and power connections.
- Female DB‑9 connector for RS‑232 interface.
- Quick‑start and wiring documentation.

Optional Accessories:
- RS‑485 twisted‑pair shielded cable (120 Ω characteristic impedance).
- 120 Ω ± 2 % termination resistors.
- DIN‑rail mounting clips.
- External DC power supply (10–30 V DC).
- NuDAM Administration Utility software (Windows).

Connectors:
- RS‑232 (DB‑9 female):
- Pin 2 – TXD, Pin 3 – RXD, Pin 5 – GND, Pin 7 – CTS, Pin 8 – RTS.
- RS‑422/RS‑485 (10‑pin terminal):
- 1 – DATA+, 2 – DATA–, 3 – DEFAULT*, 4 – TX+, 5 – TX–, 6 – RX+, 7 – RX–, 8 – FGND, 9 – +VS, 10 – GND.

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### 6. Installation & Setup

Requirements:
- Host computer or controller with RS‑232 or RS‑485 interface.
- DC power supply (10–30 V DC).
- Shielded twisted‑pair cabling for RS‑485 network.

Mounting Options:
- DIN‑rail or panel mounting using captive hardware.

Setup Procedure:
1. Software Installation:
Install *NuDAM Administration Utility* from the ADLINK CD or website.
2. Initial Configuration:
- Factory defaults: Address = 01, Baud = 9600 bps, RS‑485 interface, checksum disabled.
- To change settings, short the DEFAULT* pin to GND during power‑on to enter *Default State* (Address 00, 9600 bps).
3. Initialization:
- Connect ND‑6531 to an existing RS‑485 network via ND‑6520/6530 converter.
- Use the utility to assign a unique address ID and desired baud rate.
4. Network Integration:
- Ensure identical baud rate and checksum settings across all modules.
- Connect DATA+ and DATA– lines observing polarity.
- Apply 120 Ω termination resistors at both ends of the RS‑485 bus.
5. Power‑Up Sequence:
- Power on host → power on ND‑6531 → verify communication via utility.

Wiring Example:
- RS‑485 DATA+ ↔ Pin 1, DATA– ↔ Pin 2.
- RS‑232 TXD/RXD ↔ DB‑9 pins 2 & 3.
- Power +10–30 V ↔ Pin 9 (+VS), Pin 10 (GND).
- Optional FGND ↔ chassis ground for EMI suppression.

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### 7. Performance & Capabilities

| Parameter | Performance |
|----------------|----------------|
| Baud Rate Range | 1.2 kBd – 115.2 kBd (independent per interface) |
| Data Format (RS‑232) | 5–8 data bits, 1–2 stop bits, None/Even/Odd parity |
| RS‑485 Bus Capacity | Up to 128 modules per segment (256 with repeater) |
| Max Cable Length | 1200 m (4000 ft) per segment |
| Isolation Voltage | 1000 V DC |
| Surge Protection | TVS diodes on differential lines |
| Auto Direction Control | Yes (RS‑485 half‑duplex) |
| Power Consumption | 1.008 W typical |
| Operating Temperature | –10 °C to +70 °C |
| Reliability Features | Watchdog reset, power‑reversal protection |
| Limitations | Not suitable for RS‑232 devices requiring hardware flow control beyond RTS/CTS; maximum 115.2 kbps. |

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### 8. Standards & Compliance

- Electrical Standards:
- EIA RS‑232, RS‑422, RS‑485 compliant.
- Isolation & Safety:
- 1000 V DC isolation between ports.
- Reverse‑polarity protection on power input.
- EMC Compliance:
- CE Class A (industrial environment).
- Environmental:
- Operating –10 °C to +70 °C, Storage –25 °C to +80 °C.
- Network Topology Support:
- Simple, branch, and free‑topology RS‑485 networks.
- Termination Recommendation:
- 120 Ω ± 2 % resistors at both ends of each bus segment.

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### 9. Additional Information

Warranty:
- One‑year limited warranty from date of purchase.
- Covers defects in materials and workmanship under normal use.
- Excludes damage from misuse, modification, or operation beyond specifications.

Support & Maintenance:
- Technical support and firmware updates available from ADLINK.
- NuDAM Administration Utility provides configuration, diagnostics, and firmware management.
- Modules feature watchdog and self‑reset for fault recovery.

Maintenance Guidelines:
- Use shielded twisted‑pair cabling (22–26 AWG).
- Maintain proper grounding (connect FGND to chassis).
- Avoid installation near high‑power or high‑frequency equipment.
- Ensure stable DC power supply (10–30 V DC).
- Do not connect or disconnect the DEFAULT* pin while powered.

Software Utility Functions:
- Module search and network scan.
- Address and baud‑rate configuration.
- Command terminal for manual testing.
- Batch command execution and calibration tools.
- Real‑time monitoring and diagnostics.

Firmware & Command Set:
- ASCII‑based command/response protocol.
- Supports configuration, data pass‑through, RTS/CTS control, and watchdog management.
- Compatible with ND‑6520/6530 command syntax.

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### Summary

The ADLINK NuDAM ND‑6531 is a robust, addressable RS‑422/RS‑485 ↔ RS‑232 converter module engineered for industrial data acquisition and control networks. It combines electrical isolation, flexible baud‑rate configuration, and addressable communication in a compact, low‑power design. With its 1000 V DC isolation, surge protection, and CE Class A compliance, the ND‑6531 ensures reliable operation in harsh industrial environments.

Ideal for integrating RS‑232 instruments into RS‑485 multi‑drop systems, the ND‑6531 supports up to 128 devices per bus, independent baud rates, and full compatibility with the NuDAM‑6000 ecosystem. Its straightforward installation, software configurability, and watchdog protection make it a dependable solution for industrial automation, SCADA, and remote monitoring applications.