Design Features

The NTX-200 Substation Controller, smallest of our NTX Series modular substation system designs, incorporates complete substation management functionality. It also adds the ability to interface to a large amount of data from IEDs and to a small to medium amount of locally-wired data acquisition and control devices in the substation. The NTX-200 utilizes a client/server design. Throughout the NTX-200, servers (such as NTX Gateway to IEDs) produce data, and clients (such as the NTX gateway supplying the virtual databases to the master) receive data. It can also transmit many selected subsets of this data to one or more master stations in the master’s native protocol. Local I/O can also be configured in the three motherboard slots available.


In order to take maximum advantage of the client/server model, the NTX-200 uses a distributed processing architecture. Multiple high-performance ARM9E (Advanced RISC Machine) 32–bit microprocessors, each programmed to support specific functions, are linked together using a peer–to–peer type network. The ARM9E microprocessor-controlled high-capacity serial and Ethernet gateways make the NTX-200 an ideal, low–cost substation solution for data concentrator and protocol converter applications in small– to medium–sized substations. 


Design Features:

  • Distributed processing architecture featuring multiple high-performance, ARM9E 32–bit microprocessors with DSP extension in a client/server, peer–to–peer type LAN
  • Embedded Linux operating system (not accessible by the user, for secure operating conditions)
  • Legacy protocols from previous Connex NTU models will be supported based on demand
  • Extended temperature range of –10° to 70°C (14° to 158°F)
  • Multiple Virtual RTUTM database mapping
  • Field programmable; remotely programmable via an Ethernet WAN/LAN
  • Sequence–of–events reporting with 1ms resolution
  • Built-in IRIG-B (unmodulated) Time Code Reader and GPS time reference (NMEA 0183) interface (optional external antenna required) or NTP time synchronization supported via the Ethernet Network
  • Optional IEC 611131–compliant NTX Logic PLC that executes user–defined control and/or calculation algorithms
  • Two USB channels: one for mini–USB to USB connections to the maintenance channel; one to support a thumb drive to update firmware and archive configuration files
  • Multiple 10/100 BaseT Ethernet with DNP or Modbus RTU protocol over TCP/IP or UDP client, server or multiples of both, with a high quantity of IP connections available per port
  • EURO Card format (3U x 42hp); mid-plane motherboard where the front module contains the majority of the Logic (Network CPU Node), and the rear module contains the corresponding terminations
  • Multiple master/IED isolated communication serial interfaces (configurable per port for RS–232C, with or without flow-control, to external modems or fiber optics, or RS–485 for copper)


Application and expansion:

The NTX-200 can be used in a traditional centralized equipment rack– or wall–mounted cabinet. The three-slot I/O motherboard supports:

  • up to three 16-point DC Analog Input Modules
  • or up to three 32-point Digital Input Modules
  • or up to three Bell 202 FSK Modems
  • or any combination of these modules in the three slots. 


The NTX-200 I/O is not expandable beyond the base three-slot I/O Motherboard. An NTX System Controller with termination provides a combination of router and dual-serial ports with an Ethernet Port, a 4 x 6 control relay driver matrix and DC Analog Output Channel functionality as the base communications, and an NTX internal network controller. Up to 24 external control relays can be equipped with both momentary (varying contact voltage/current ratings support) and latch relays and two external DC Analog Output channels. 


The unit power supply and up to three additional NTX Quad-Serial with Ethernet port gateways can be incorporated in the card file mid-plane system motherboard—for a total of 14 isolated EIA561 RS-232/RS-485 RJ45 serial ports and 4 high-capacity 10/100 Ethernet ports.  NTX Explorer software makes it easy to configure or expand the type and number of ports and protocols communicating with the master stations or IEDs, defining local I/O points, and/or other components. The NTX-200 can also serve as a remote Data Acquisition and Control node in a distributed substation system. 


NTX Explorer software makes it easy to configure or expand the type and number of ports and protocols communicating with the master stations or IEDs, defining local I/O points, and/or other components. 


Key Specifications (see product brochure for complete list)
Card file dimensions
Complies with IEEE 1101/11 & IEEE 1011.10 standards 42 HP wide and 3U high (9” W x 5.25” H x 12” D with 10.75” centers for panel-mounting) for single Euro-card format modules, bottom wall- or panel-mounted
Time clock
On–board UTC time/date clock, non–volatile; internal time code reader for satellite clock unmodulated IRIG–B (with P1344 extensions) time synchronization or with optional antenna, GPS clock time synchronization (NMEA 0183 protocol), or NTP via the Ethernet network
Database capacity
14,000 data values per system controller and NTX gateway
Serial port connections
EIA 561 standard RJ45 DTE connectors
Ethernet connection
RJ45, with multiple client, server and multiples of both; IP configurable
Serial communication ports
Isolated digital EIA561 RS–232C DTE (with or without handshaking) or RS–485 serial interfaces, configurable per RJ45 port
Optional external fiber optic transceiver
Serial analog operation channel
Two– or four–wire (9600 baud with optional external modem; 1200 baud with optional internal Bell 202 modem)
Serial baud rate
300 to 115,200 bits per second, selectable per port Includes radio keying with isolated PTT output
Local programmable logic
NTX Logic is a Programmable Logic Controller (PLC) application that runs on a NTX System Controller platform with a termination module. Firmware fitted with the Run-Time License and external programming accessibility. The NTX Logic supports all of the standard IEC 61131 & 61499 control program languages, as well as Flow Chart.
Binary input capacity
96 points, in groups of 32 inputs (limited to three I/O module slots) Configurable per point as binary with time (SOE 2), binary without time (Status), or Form A or two consecutive as Form C counters
Counter input capacity
48 Form C or 96 Form A points, in groups of one input
DC analog input capacity
48 points, in groups of 16 inputs (limited to 3 I/O module slots) Standard: 0 ± 1 mA (optional: 4–20 mA, 0 ± 1.5 mA, 0 ± 2 mA, 0 ± 10 mA, 0 ± 5 VDC, etc.)
DC analog output capacity
2 analog outputs, in groups of 1 channel (Isolated 4–20 mA)
Control output capacity
Optically isolated drivers for up to 24 relays (in groups of 4 or 8 relays)
Power supply input
24 VDC, 48 VDC, 125 VDC/VAC, 120 VAC
Optional battery charger
Sealed lead–acid; 6 hours backup, typical

Misc. Options

Custom enclosures, with or without optional heater

Other external terminal block options

Bell 202 or 9600 baud 4–wire multi–drop telephone modem

External GPS satellite clock and antenna


More Information

For more information call 800.831.7223 or contact This email address is being protected from spambots. You need JavaScript enabled to view it.



NTX-200 substation controller Brochure PDF


ACS NTX-200 substation controller Product Brochure

NTX-200 block diagram Brochure PDF


ACS NTX-200 block diagram Brochure