ST‑NCTL210 Network Serial Port Expander
ST‑NCTL210 Network Serial Port Expander
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4-Port Serial Device Server
Network Serial Port Expander
Model: ST-NCTL210 | Firmware Ver 2.0 | RS-232 / RS-422 / RS-485
This Network Serial Port Expander, with 4 extended input/output serial ports, communicates with any programmable central control system or PC to control multiple devices and perform protocol conversion between various devices with different communication modes. Built-in RS-232 and 100 M Ethernet interfaces make it compatible with AMX, Crestron, RTI and all other third-party control systems. Front-panel LED indicators give instant visibility into power, data activity and relay status.
Key Features
Package Contents
①
1 × Network Serial Port Expander②
2 × 5-pin Phoenix Connector (3.81 mm, male)③
2 × 7-pin Phoenix Connector (3.81 mm, male)④
1 × 8-pin Phoenix Connector (3.81 mm, male)⑤
2 × 9-pin Phoenix Connector (3.81 mm, male)⑥
4 × Machine Screw⑦
2 × Mounting Ear⑧
1 × 24 V/1 A Power Adaptor + 2-pin 3.5 mm Phoenix Connector⑨
1 × User Manual
Specifications
| Parameter | Details |
|---|---|
| RS-232 | Full duplex; configurable hardware flow control |
| RS-422 | Full duplex communication mode |
| RS-485 | Half duplex communication mode |
| Baud Rate | 2400 / 4800 / 9600 / 14400 / 19200 / 38400 / 56000 / 57600 / 115200 |
| LAN | 10/100 M Ethernet interface (RJ45) |
| Relay Output | 4 × normally-open, isolated — up to 1 A / 24 V DC/AC |
| Inputs | 1 × LAN [RJ45], 1 × MAIN COM [7-pin phoenix], 1 × DC 24 V [2-pin phoenix] |
| Outputs | 1 × NEXT COM [7-pin], 2 × COM 1/2 [9-pin], 2 × COM 3/4 [5-pin], 1 × RELAY OUTPUT [8-pin] |
| Power Supply | Input: AC 100–240 V 50/60 Hz — Output: DC 24 V / 1 A |
| Power Consumption | < 2 W |
| Operating Temperature | 0 °C ~ 40 °C / 32 °F ~ 104 °F |
| Storage Temperature | −20 °C ~ 60 °C / −4 °F ~ 140 °F |
| Relative Humidity | 20–90 % RH (non-condensing) |
| Dimensions | 147 mm (W) × 130 mm (D) × 42 mm (H) |
| Housing / Color | Metal enclosure — Black |
| Weight | 673 g |
Front Panel
Front Panel Layout
| # | Name | Function |
|---|---|---|
| 1 | LAN LED | Network connection indicator — green flashes when network communication is active. |
| 2 | POWER LED | Green light on when the device is powered up. |
| 3 | RELAYS LED | Relay closing indicator — green stays on when relay is set to closed. |
| 4 | RS-232/422/485 LED | TX/RX indicators for each extended serial port — red flashes on send, yellow flashes on receive. |
Rear Panel
Rear Panel Layout
| # | Label | Function & Pin-Out |
|---|---|---|
| 5 | DC 24V | DC 24 V / 1 A power input (2-pin phoenix connector). |
| 6 | RESET Button | Hold 5 seconds → factory reset. IP restores to 192.168.1.100. |
| 7 | LAN Port | 10/100 M network port (RJ45). Use direct (non-crossover) UTP cable. |
| 8 | MAIN COM | Main serial port for central control or PC. RS-232: PIN5=GND, PIN6=TXD, PIN7=RXD. RS-422: PIN1=RX−, PIN2=RX+, PIN3=TX−, PIN4=TX+, PIN5=GND. RS-485: short PIN1(RX−)+PIN3(TX−)→B; PIN2(RX+)+PIN4(TX+)→A. |
| 9 | NEXT COM | Main serial port cascade output (same pin-out as MAIN COM). |
| 10 | RELAY OUTPUT | 4 × independent, isolated, normally-open relay contacts. Max 1 A / 24 V DC/AC. |
| 11 | RS-232/422/485 | COM1 & COM2 (9-pin): RS-232+HW / RS-422 / RS-485. PIN1=RX−, PIN2=RX+, PIN3=TX−, PIN4=TX+, PIN5=GND, PIN8=RTS, PIN9=CTS. COM3 & COM4 (5-pin): RS-232 only; PIN5=GND, PIN6=TXD, PIN7=RXD, PIN8=RTS, PIN9=CTS. |
| 12 | GND | Chassis ground connection point. |
Application Example
In a typical AV control room, the Network Serial Port Expander acts as the central hub: a Laptop and DVD player connect via RS-232, while the expander drives the Projector via RS-232 and controls a Curtain motor through its relay output. A Dimming Controller for room lighting is driven via a second RS-232 port, and a touch-panel laptop sends commands over the LAN via a standard CAT cable — giving full automation control of the entire room from one device.
Default Network & Port Information
| Parameter | Default Value |
|---|---|
| IP Address | 192.168.1.100 |
| Subnet Mask | 255.255.255.0 |
| Gateway | 192.168.1.1 |
| IP Mode | DHCP OFF (static) |
| TCP/UDP Mode | TCP |
| Extend COM1–4 TCP Ports | 8001 / 8002 / 8003 / 8004 |
| System TCP Port | 8005 |
| Extend COM1–4 UDP Local Ports | 9001 / 9002 / 9003 / 9004 |
| System UDP Local Port | 9005 |
| Extend COM1–4 UDP Remote Ports | 1001 / 1002 / 1003 / 1004 |
| System UDP Remote Port | 1005 |
| Main COM Baud Rate | 115200 (8 data bits, 1 stop, no parity) |
Caution: This product requires UTP connectors wired using the direct interconnection method (T568A or T568B straight-through). Do not use a crossover cable. Use of a surge protection device is strongly recommended to protect sensitive internal components. AMX® and CRESTRON® are registered trademarks of their respective owners.
Product features
Product features
Materials and care
Materials and care
Merchandising tips
Merchandising tips
