Overview
Bently Nevada 3500/20 Rack Interface Module
Configured for rack communication management in the Bently Nevada 3500 Monitoring System, the Bently Nevada 3500/20 (125744-02 Rack Interface Module) provides direct physical and electrical execution for serial data exchange between the rack system and external communication devices.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/20 |
| Spare Model | 125744-02 |
| Brand | Bently Nevada |
| Product Type | Rack Interface Module |
| Origin | USA |
| Weight | 0.84 kg |
| Dimensions | Estimated shipping size: 2.5 x 25 x 24 cm |
| Operating Temp | Not specified |
| Power Consumption | 4.75 watts typical |
| System Platform | Bently Nevada 3500 Series Machinery Protection System |
| Input Voltage | 24 VDC / 120 VAC compatible configuration |
| Communication Interface | RS232 serial communications |
| Standard Communication | RS232 serial communications |
| Communication Protocol | Hayes AT-compatible |
| Standard Data Rate | 38.4 k baud |
| Maximum Baud Rate | 14.4 k baud |
| Maximum Cable Length | 2.1 metres (7 feet) for RS232 connection; 1200 metres (4000 feet) maximum for extended communication connection |
Bently Nevada 3500 Serial Communication and Rack Data Interface
The 3500/20 Rack Interface Module manages communication between the 3500 rack backplane and external serial communication equipment. It transfers rack status data, monitoring information, and configuration access through RS232 serial communications.
Additionally, the module supports Hayes AT-compatible communication commands for external interface control. The design allows integration with 3500 system software and compatible diagnostic equipment.
For machinery monitoring applications, the module operates within the Bently Nevada TSI environment where vibration monitoring data, Keyphasor signals, and protection parameters require controlled communication paths. The communication interface maintains data access for rotor dynamics analysis and machinery condition evaluation.
The module also supports system-level diagnostics through front-panel LED indicators. These indicators provide local status observation during commissioning and maintenance activities.
Frequently Asked Questions
Q: What communication interface does the Bently Nevada 3500/20 provide?
A: The 3500/20 provides RS232 serial communications and supports Hayes AT-compatible communication commands.
Q: What is the typical power consumption of the 3500/20 Rack Interface Module?
A: The module consumes approximately 4.75 watts under typical operating conditions.
Q: Can the 3500/20 be installed in a Bently Nevada 3500 rack system?
A: Yes. The 3500/20 is designed as a Rack Interface Module for the Bently Nevada 3500 Series Monitoring System and connects through the rack communication structure.
Field Installation Guidelines
Install the 3500/20 module into the designated slot position of the Bently Nevada 3500 rack according to the system configuration requirements.
Verify the rack power supply voltage before module installation. Confirm that the selected power configuration matches the module input requirements of 24 VDC or 120 VAC.
Use shielded communication cables for RS232 connections where electrical noise may affect signal integrity. Connect cable shields according to the site grounding practice and avoid routing communication cables parallel to high-current power conductors.
Check front-panel LED indicators after startup to confirm normal module status. During commissioning, verify serial communication settings, baud rate configuration, and external device communication compatibility.
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