BENTLY 3500/20 125744-02 Rack Interface Module

BENTLY 3500/20 125744-02 (Rack Interface Module RIM)
3500/20 (125744-02) is an essential core RIM * * for the 3500 system, responsible for rack configuration, data aggregation, and external serial communication; 2026-05 has been discontinued and replaced by 3500/22M (integrated RIM+TDI).

1、 Basic Information
Model: 3500/20; Part number: 125744-02
Brand: Bently Nevada (currently owned by Baker Hughes)
Series: 3500 Mechanical Protection System (TSI)
Type: Rack Interface Module (RIM)
Status: Discontinued (DISC); The market is mainly second-hand/refurbished, with a small inventory of new goods
Installation: It must be plugged into slot 1 of the rack (adjacent to the power supply), occupying slot 1
Positioning: Unique configuration and communication gateway for 3500 rack
2、 Core functions
System configuration: Configure all rack modules (such as 3500/40M, 42M) and set alarm/trip values through proprietary protocols.
Data collection: Summarize the steady-state data of vibration, displacement, speed, key, etc. from each monitoring card.
Serial communication: RS232/RS422 transmits data externally and connects to System 1, DCS, or configuration software.
Status and Interlocking: Front panel OK/TX/RX indicator lights; **OK relay (5A 24VDC) * * outputs the health status of the rack.
Expansion docking: Can be externally connected to TDXnet/TDIX/DDIX communication processors to expand transient data or network capabilities.
3、 Technical parameters
Power consumption: Typical 4.75W
interface
RS232: DB9, 38.4kbps (auto baud), up to 30m
RS422: Terminal block, up to 1200m in length
Protocol: Bently proprietary (supports System 1 configuration/data reading)
Dimensions (H × W × D): 241 × 24 × 242mm (9.5 × 0.96 × 9.5in)
Weight: Approximately 0.9kg
Working temperature: -30 ℃ to+65 ℃; Storage: -40 ℃~+85 ℃
Certification: CE, CSA, ATEX; Compliant with API 670

4、 Relationship with 3500/22M (key)
3500/20 (RIM): only responsible for configuration+steady-state data+serial port; No transient waveform upload capability, additional TDXnet is required.
3500/22M (TDI, such as 288055-01): Integrated RIM+TDI, retains all RIM functions, adds Ethernet+USB, supports direct upload of high-speed transient waveforms to System 1, completely replacing 3500/20.
Model replacement: The new project can directly use 3500/22M; upgrading the old rack can directly replace slot 1.
5、 Procurement and Marketing
Price: Second hand/refurbished approximately $800- $1500 * *; Inventory of new goods is approximately * * $2500- $3800 * *, with a warranty of 6-12 months.
Applicable scenarios: Maintenance of old frames in TSI systems for rotating machinery such as steam turbines, compressors, and generators.
6、 Quick identification
Panel identification: 3500/20 RACK FACE MODULE
Interface: DB9 (RS232)+Terminal Block (RS422)+Keyswitch
Indicator lights: OK, TX, RX