Brand: ABB

ABB FSCA-01 RS-485 Modbus RTU Adapter Module for ABB Drives

Name: ABB FSCA-01 RS-485 Modbus RTU Adapter | Seven Star LLC
Brand: ABB
SKU: FSCA-01

Description

Modbus RTU serial adapter for ABB drives

The FSCA-01 is a serial fieldbus adapter that gives ABB drives an isolated RS-485 interface for Modbus RTU. It suits older PLCs, energy meters, BMS gateways and any panel where simple two-wire serial communication is enough.

The manual’s compatibility list includes ACS355, ACH580, ACQ580, ACS580 and ACS880 among other families, which makes the same module useful across a mixed fleet.

Technical specifications

Parameter	Specification
Type designation	FSCA-01
Function	RS-485 serial adapter, Modbus RTU
Connector	4-pin screw terminal
Termination	Built-in 120 ohm, jumper selected
Data rates	9.6 to 115.2 kbit/s
Isolation	Galvanically isolated
Supply from drive	+3.3 V, max 400 mA
Drive families (manual)	ACS355, ACH580, ACQ580, ACS580, ACS880 and others

Wiring and termination

Connection is through a four-pin screw connector. A 120 ohm termination is built in and activated with a jumper, so only the two end nodes need it switched on. Data rates run from 9.6 to 115.2 kbit/s, and the interface is galvanically isolated from the drive.

The module takes +3.3 V from the drive, maximum 400 mA. It is fitted in an option slot and configured in the fieldbus parameter group, with the manual giving example settings per drive family.

Choosing serial over Ethernet

Serial links are slow compared with Ethernet but are simple to troubleshoot and tolerant of long, cheap cable runs. Use the FSCA-01 where only a handful of registers are polled.

Good practice: shielded twisted pair, one shield ground point, consistent baud rate, parity and address on every node.

Selection and planning notes

A typical Modbus RTU setup polls a short list of holding registers: control word, speed reference, status word, actual speed, current and fault code. At 19200 baud, a poll of ten registers per drive takes a few tens of milliseconds, which is fine for ventilation and pumping but slow for coordinated motion. Always keep the polling interval comfortably above the drive’s communication timeout, so one missed reply does not trip a fault.

Compatible drives are listed under AC drives; the ABB ACS580 page explains one of the common platforms. We can help decide between this serial adapter and an Ethernet option for the drive.

A short wiring test saves hours. With power off, measure the resistance between the two data lines at the network end: two active terminations in parallel read roughly sixty ohms. A reading near one hundred and twenty ohms means one end is not terminated; a value far below sixty means too many terminators are active. Check that the common reference or shield is connected consistently, and that the cable is not routed along motor cables, whose switching noise couples into long serial runs.

Documents and quotation

Seven Star LLC supplies the FSCA-01 on request from Muscat; send the drive type, control program version and the network details, and we reply with availability and lead time. The user manual (3AUA0000109533, revision C) is linked on this page.

Confirm before ordering: the drive series, whether the drive already has an embedded Modbus port, the baud rate and parity set, and termination at both bus ends.

Datasheets & Documents

fsca Manual Download

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About brand

ABB is the Swiss-Swedish engineering group for electrification and automation: low voltage drives, motors, circuit breakers and motor control, process instruments and analysers, control systems and robots. It was formed on 5 January 1988 by the merger of two older companies. ASEA was founded in Västerås, Sweden, in 1883 by Ludvig Fredholm to make electric lighting and generators. BBC Brown Boveri was founded in Baden near Zurich in 1891 by Charles E. L. Brown and Walter Boveri. ABB Ltd is incorporated in Switzerland, headquartered in Zurich and listed on the SIX Swiss Exchange and Nasdaq Stockholm.

ABB company profile

Formed	5 January 1988, by the merger of ASEA (Sweden) and BBC Brown Boveri (Switzerland), each holding 50%
ASEA	Founded 1883 in Västerås, Sweden, by Ludvig Fredholm; first products electric lighting and generators
Brown, Boveri & Cie	Founded 1891 in Baden, Switzerland, by Charles E. L. Brown and Walter Boveri
Headquarters	Zurich, Switzerland; ABB Ltd became the group holding company in 1999
Ownership	Public company listed on SIX Swiss Exchange and Nasdaq Stockholm
Brands in the group	Baldor (US motors, acquired 2011), B&R (machine automation, acquired 2017), K-TEK level instruments, Endura and Navigator analysers, SACE breakers
Product families	Low and medium voltage drives (ACS series), motors, SACE Tmax and Emax breakers, contactors and soft starters, flow, pressure, temperature and level instruments, liquid and gas analysers, Contrac actuators, AC500 PLCs, Ability System 800xA and S800 I/O, protection relays, robots

Milestones

1883: ASEA is founded in Västerås, Sweden.
1891: Brown, Boveri & Cie is founded in Baden, Switzerland.
1987–1988: The merger is announced on 10 August 1987; ABB Asea Brown Boveri starts operating on 5 January 1988.
1999: ABB Ltd, incorporated in Switzerland, becomes the single holding company of the group.
2011 and 2017: Baldor Electric and B&R join ABB.
2020: ABB sells its power grids business to Hitachi, focusing on electrification, motion, process and machine automation.

Choosing an ABB drive

ABB's ACS drive codes are easy to read once you know the pattern. In ACS580-01-046A-4, "ACS580" is the drive family, "01" means a wall-mounted single drive, "046A" is the rated output current (about 46 A) and "-4" means a 380–480 V supply. The family is chosen by application: ACS355 for compact machinery, ACS310 for simple pumps and fans, ACS580 as the general-purpose drive, ACQ580 for water and wastewater with pump functions such as pipe fill and dry-run protection, and ACS880 for heavy industrial duty with direct torque control. Size the drive on the motor's full-load current, not only its kW rating, and allow derating for the high ambient temperatures common in Gulf electrical rooms.

Where ABB products are used

In Oman and the GCC, ABB drives and motors run pumps, fans and compressors in water and wastewater plants, district cooling, oil and gas and industry. ABB flowmeters, level instruments and analysers are used in water utilities, power and desalination plants and refineries, and SACE breakers protect switchboards in buildings and plants.

ABB products we list

Family	Examples
AC drives	ACS580, ACS580-01-046A-4, ACQ580, ACS355, ACS310, ACS880-01, FEN-31 encoder module
Breakers, motor control and protection	SACE Tmax XT, XT3N 250, SACE Emax 2, AF09 contactor, PSR soft starter, REM615 relay
Flow measurement	ProcessMaster FEP300, AquaMaster4, CoriolisMaster FCB430, VortexMaster FSV430, SwirlMaster FSS430, OriMaster FPD500
Pressure, temperature and level	266DRH, 267CS multivariable, TTH300, K-TEK AT100, LMT200, MT5000 GWR, KM26 gauge
Analysers	Endura AZ20, AK100 hydrogen purity, Navigator AW641 silica, AW402 chlorine, AWT210
Control systems and actuators	AC500, AC500-S, S800 AI810, AC 800F SA 811F, Contrac RSD50, Contrac RHD4000

Ordering ABB products: what we need

Send the full type code from the nameplate (for example ACS580-01-046A-4 or 266DSH...) and, for spare parts, the ABB ID number (such as 3BSE008508R1 or 1SBL176001R3010). For drives, add the motor power and current and any option codes (+...). For instruments, send the complete order code, which sets range, materials and approvals. Baldor motors are listed on their own brand page.

Facts checked against ABB company filings and published histories of ASEA and Brown, Boveri & Cie, October 2026.