Manufacturer product photo · industrial IoT gateway for environment monitoring
EMS-200
IoT Gateway · Environment Monitoring Host
Industrial IoT Gateway for Environment Monitoring · 1×RS-232 + 3×RS-485 · 8×DI + 2×DO Relay · Modbus/SNMP
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◆1×RS-232 + 3×RS-485
◆8×DI + 2×DO Relay I/O
◆Modbus TCP/RTU/ASCII
◆1U 19-Inch Rack-Mount
◆SNMP MIB-II · Web Console
◆5-Year Warranty
Overview
The EMS-200 is an industrial IoT gateway for environment monitoring that bridges RS-232/485 serial devices and the TCP/IP Ethernet network, providing 1 × RS-232 and 3 × RS-485 serial ports plus 8 × DI and 2 × DO (relay) I/O interfaces. Built around a high-performance 32-bit processor with an embedded system for stable, reliable, low-power operation, it supports standard Modbus TCP and Modbus RTU/ASCII protocols alongside SNMP MIB-II, Real COM/TTY drivers and Web-console configuration. It is widely used in power monitoring, equipment-room monitoring, PLC, smart meters, gas meters, biometric devices and card readers.
Is This the Right Fit?
Six real deployment scenarios matched to this model's actual datasheet specifications.
Equipment Room Environment Monitoring8×DI plus 2×DO relay outputs, together with 1×RS-232 and 3×RS-485 serial ports on a 19-inch 1U rack-mount chassis, let the EMS-200 aggregate a full equipment room's environmental sensors and switching-value alarms into one Modbus/SNMP-managed IoT gateway.
Legacy Serial Equipment to IP NetworkingWith 1×RS-232 and 3×RS-485 ports covering 110–460800bps, the EMS-200 lets legacy serial instruments and controllers join the TCP/IP Ethernet network — no extra PC required to link two peer serial devices over the network.
Outdoor / Unconditioned Equipment CabinetThe optional wide-temperature build operates from -40 to +75°C (storage -40~85°C), suited to unheated equipment rooms and outdoor cabinets exposed to seasonal extremes.
Switch-Signal Acquisition & Remote Relay Control8×DI plus 2×DO relay outputs, all with photoelectric/electromagnetic isolation protection, let the EMS-200 capture door-access, humidity, water-leak or smoke-sensor switch signals while remotely driving equipment on/off through the relay outputs.
Modbus TCP/RTU/ASCII Protocol BridgingBuilt-in support for standard Modbus TCP and Modbus RTU/ASCII lets the EMS-200 bridge serial PLCs, smart meters and gas meters into a Modbus TCP-based monitoring network, matching the datasheet's listed power-monitoring, equipment-room-monitoring, PLC, smart-meter and gas-meter applications.
SNMP MIB-II Network Management IntegrationSupport for the simple network management protocol SNMP MIB-II, plus a Web console for management and configuration, lets network operators pull the EMS-200 into an existing NMS platform for centralized monitoring alongside other managed network gear.
Not a good fit if:
- IP40 metal enclosure only — direct outdoor rain or dust exposure needs a cabinet or additional protection.
- Single DC 36–56V power input only — no redundant dual-input option is listed for this series.
- Fixed I/O count of 1×RS-232 + 3×RS-485 serial ports and 8×DI + 2×DO relay outputs — not user-expandable, and the datasheet lists no analog I/O (AI/AO) channel count for this model.
Key Features
- Industrial IoT gateway bridging RS-232/485 serial devices to the TCP/IP Ethernet network
- High-performance 32-bit processor · highly integrated, low-power design for industrial environments
- Standard Modbus protocol support: Modbus TCP, Modbus RTU/ASCII
- Digital/analog input-output and relay-output business interfaces
- Local real-time clock plus Modbus alarm-log storage
- Windows Real COM driver and Unix/Linux TTY driver — complete serial data delivered to user applications
- Universal Socket modes (TCP Server/Client, UDP) — connect two peer serial devices over the network without adding a computer
- 10/100M auto-negotiating Ethernet interface, manual mode setting supported
- Built-in 15KV ESD protection on all signals
- SNMP MIB-II support with Web-console management — easy to operate and maintain
Specifications
LAN
| Ethernet | 10/100 Mbps, RJ45 |
| Protection | Built-in 1.5KV electromagnetic protection |
Serial Interfaces
| Quantity | 1 × RS-232, 3 × RS-485 |
| Port Type | DB-9, terminal block |
| RS-232 Signal | TXD, RXD, GND |
| RS-485 Signal | Data+, Data-, GND |
| Serial Protection | All signals with 15KV ESD protection |
| Parity | None, Even, Odd, Mark, Space |
| Data Bits | 5, 6, 7, 8, 9 |
| Stop Bits | 1, 1.5, 2 |
| Flow Control | Xon/Xoff |
| Speed | 110 ~ 460800 bps |
I/O Interfaces
| Quantity | 8 × DI, 2 × DO (relay) |
| Port Protection | All I/O ports with photoelectric/electromagnetic isolation protection |
Power Output
| DC Power Output | 12V/30W DC high-power output |
Software Features
| Protocol | Modbus, ICMP, IP, TCP, UDP, DHCP, Telnet, SNMP, HTTP |
| Tool | Windows 2000/XP management software supported |
| Driver Support | Windows 2000/XP Real COM driver, Unix/Linux TTY driver |
| Configuration | Web browser, Telnet, Console |
Power Input Requirement
| 24V Power Input | Input range 36–56V DC |
| Power Consumption | 230mA @ 12V |
Environment
| Standard Temp | -10 ~ +60°C |
| Wide Temp | -40 ~ +75°C |
| Storage Temp | -40 ~ +85°C |
| Humidity | 5–95% non-condensing |
Physical
| Housing | IP40 metal enclosure |
| Mounting | Standard rack-mount installation |
| Dimensions | 240 (W) × 44 (H) × 110 (D) mm |
Warranty
| MTBF | 320,000 hours |
| Warranty Period | 5 years |
Models & Ordering
| Model | Product Description | Price |
|---|---|---|
| ZJEMS-200-DCH | 19-inch 1U rack-mount environment monitoring host — 1×RS-232, 3×RS-485, 8×DI, 2×DO; supports Modbus RTU, Modbus TCP, virtual serial port and TCP Socket working modes; SNMP supported; IP40; DC48V powered. |
This page covers the EMS-200 series full-I/O variant (1×RS-232, 3×RS-485, 8×DI, 2×DO relay outputs). The listed configuration model ZJEMS-200-DCH is a 19-inch 1U rack-mount build with SNMP support, IP40 protection and DC48V power. A reduced-I/O sibling model, EMS-200-150 (2×RS-485, 6×DI, no RS-232, no relay output), is also available in the series. The requested model is EMS-200.
Dimensions
unit: mm
Your Brand. Factory-Direct Supply.Neutral casing, ready for your logo · Custom port/power options · Small batches welcome.
Custom & OEM →Who uses it, where it goes and how to wire it
Written for the EMS-200 (order code ZJEMS-200-DCH) from its own specifications: 1 × RS-232 and 3 × RS-485 serial ports, 8 × DI and 2 × DO relay outputs, Modbus TCP/RTU/ASCII and SNMP MIB-II, 12V/30W DC output for sensors, DC48V input (36–56V DC).
Who it is for
- Telecom and base-station operators — Runs from the site's 48V DC plant (36–56V DC input), and its 8 DI inputs pick up door, water-leak and smoke contacts in unmanned shelters, with the optional -40 to +75°C build for unheated sites.
- Data-room and server-room teams — A 1U rack unit that polls Modbus RTU devices on 3 RS-485 ports and is managed over SNMP MIB-II and a web console, so room alarms show up next to the other network gear in the NMS.
- Power and utility monitoring integrators — Bridges serial smart meters, gas meters and PLCs to Modbus TCP, keeps an alarm log with a local real-time clock, and the 2 relay outputs can switch a local alarm or a control circuit.
- Owners of legacy serial equipment — Real COM / TTY drivers and TCP Server/Client/UDP socket modes put RS-232 or RS-485 card readers, biometric terminals and controllers on the IP network, at 110–460800 bps.
Where and how to install
- Rack or cabinet, not open air — The EMS-200 is an IP40 metal unit, 240 × 44 × 110 mm, for standard rack mounting. Fit it in the equipment rack or an outdoor cabinet, never exposed to rain or dust. The body is narrower than a full 19-inch rack, so confirm the rack ears with us or set it on a cabinet shelf.
- Power from the 48V DC system — Feed it from the site's 48V DC distribution through its own breaker or fuse; the input accepts 36–56V DC. Check polarity on the terminal before switching on, and keep it on the battery-backed DC bus so alarms still report during a mains failure.
- Wire DI sensors as contacts — Connect door contacts, water-leak, smoke and similar alarm sensors with switch outputs to the 8 DI inputs, one sensor per input, and label each one in the web console. Sensors that need power can take it from the 12V/30W DC output.
- RS-485 bus wiring — Use shielded twisted pair from the Data+, Data- and GND terminals, chained device to device rather than in a star, and give every Modbus RTU device on a port its own address and the same baud rate and parity. The 3 RS-485 ports let you keep, for example, meters, air conditioners and UPS on separate buses.
- Temperature and environment — The standard build works from -10 to +60°C at 5–95% humidity, non-condensing. For outdoor cabinets or unheated shelters that go below -10°C or above +60°C, order the wide-temperature build (-40 to +75°C) and say so in your inquiry.
Interfaces and limits at a glance
Use this to count your monitoring points before ordering: switch-type sensors go on the DI inputs, Modbus RTU sensors, meters and controllers on the serial ports, and local alarms or control on the relays. If 2 × RS-485 and 6 × DI are enough and you need no RS-232 or relay output, the smaller EMS-200-150 also exists in the series.
| EMS-200 (ZJEMS-200-DCH) | |
|---|---|
| Serial ports | 1 × RS-232 (DB-9) + 3 × RS-485 (terminal block) |
| Serial speed / protection | 110–460800 bps; 15KV ESD on all signals |
| Digital inputs (switch sensors) | 8 × DI, isolated |
| Relay outputs | 2 × DO (relay), isolated |
| Analog inputs (4–20 mA / 0–10 V) | Not listed |
| Power output for sensors | 12V / 30W DC (= 2.5 A total) |
| Ethernet | 1 × RJ45 10/100 Mbps (copper ≤ 100 m) |
| Protocols / management | Modbus TCP/RTU/ASCII, SNMP MIB-II, HTTP, Telnet, DHCP; Web / Telnet / Console |
| Power input | DC48V, range 36–56V DC |
| Operating temperature | -10 to +60°C (wide-temp build -40 to +75°C) |
| Housing / size | IP40 metal, 240 × 44 × 110 mm, rack mount |
- Count switch-type alarm points (doors, water leak, smoke): up to 8 fit on one EMS-200.
- For temperature and humidity, choose RS-485 Modbus RTU sensors, since no analog input is listed.
- Add up the draw of everything on the 12V output and keep it under 30 W; give sirens or strobes their own supply.
Values are from this page's specification table; 2.5 A = 30 W ÷ 12 V. The 100 m copper limit is the general Ethernet rule, not a page value.
Environment Monitoring Gateway FAQ — EMS-200
Which ports does the EMS-200 provide?
One RS-232 port on DB-9 and three RS-485 ports on terminal blocks, plus 8 digital inputs and 2 relay outputs, all bridged to a 10/100 Mbps Ethernet port. Serial speeds run 110 to 460,800 bps with configurable parity, data bits (5–9) and stop bits (1, 1.5, 2).
What protocols does the EMS-200 support?
Standard Modbus TCP and Modbus RTU/ASCII for SCADA integration, plus SNMP MIB-II, Telnet, HTTP, DHCP, TCP/UDP and ICMP on the network side. Real COM drivers for Windows and TTY drivers for Unix/Linux let existing serial software keep talking to field devices over the Ethernet network.
What is the EMS-200 typically used for?
It is widely used in power monitoring, equipment-room monitoring, PLC connectivity, smart meters, gas meters and biometric devices. The 8 DI channels collect dry-contact states from sensors while the 2 relay DO channels provide output control, and everything reports over one Ethernet link to the monitoring platform.
What power input does it need?
The power input accepts a 36–56 V DC range and the unit draws about 230 mA at 12 V, so consumption stays low for continuous operation. A 12 V / 30 W high-power DC output can feed sensors or small devices next to the gateway, simplifying wiring inside the cabinet.
Can it handle tough electrical and temperature conditions?
All serial signals have 15 kV ESD protection, every I/O port uses photoelectric/electromagnetic isolation, and the Ethernet port carries built-in 1.5 kV electromagnetic protection. Standard temperature range is -10 to +60 °C, wide-temperature -40 to +75 °C. The 240 × 44 × 110 mm IP40 metal chassis rack-mounts, with 320,000 hours MTBF and a 5-year warranty.
Which sensors can I connect to the EMS-200, and can it read 4–20 mA temperature sensors?
Two kinds: sensors with a switch (contact) output on the 8 DI inputs, such as door contacts, water-leak, smoke or humidity alarm switches, and devices that speak Modbus RTU on the RS-485 or RS-232 ports, such as temperature/humidity sensors, meters and PLCs. No analog (AI) input is listed, so a 4–20 mA or 0–10 V sensor cannot be connected directly; choose the RS-485 Modbus version of the sensor instead. Send us the sensor list and we will check it before you order.
How does the EMS-200 send an alarm: SMS, email or SNMP?
The page lists Modbus TCP, SNMP MIB-II and a web console, plus a local real-time clock with a Modbus alarm log, so the normal setup is a monitoring platform, SCADA or NMS that reads the EMS-200 over Modbus TCP or SNMP and raises the alarm. SMS, email and SNMP trap sending are not listed, and there is no cellular modem. For an alarm on site, use a DO relay to switch a siren or strobe; confirm with us before ordering if you need the unit itself to push notifications.
How many Modbus devices can I put on each RS-485 port of the EMS-200, and how far can the cable run?
The page does not give a per-port device count. As general RS-485 practice, one bus carries up to 32 standard unit loads over roughly 1200 m at low baud rates, and each Modbus RTU device needs a unique address. Keep long or noisy runs at a lower speed such as 9600 bps, use shielded twisted pair with 120 Ω termination at the two far ends, and split large groups across the 3 RS-485 ports.
Can the EMS-200's 12V output power my sensors?
Yes, within its rating: the DC output is 12V/30W, which is 2.5 A in total for everything connected. Add up the draw of each sensor from its own datasheet and keep a margin below 30 W. Sirens, strobes or anything with a motor are better on their own supply, switched through a DO relay.
What can the two relay outputs on the EMS-200 switch?
The 2 DO relay outputs are isolated and are meant for remote on/off control, for example a local siren, a strobe, an alarm input of another system or the coil of a contactor. The page does not list the relay contact rating, so do not switch mains loads such as air conditioners or fans directly; drive an external contactor or interposing relay and confirm the rating with us.
Should I choose the EMS-200 or the smaller EMS-200-150?
Choose the EMS-200 when you need an RS-232 device, more than 2 RS-485 buses, more than 6 contact sensors or any relay output: it has 1 × RS-232, 3 × RS-485, 8 × DI and 2 × DO. The EMS-200-150 has 2 × RS-485 and 6 × DI with no RS-232 and no relay output, so it only monitors and cannot switch anything on site.
What power connector does the EMS-200 have, and do I need to confirm it before ordering?
Yes, please confirm the power connector with us before ordering. For Zhongxin Shutong products the power input type and connector can differ between versions and batches, so tell us your supply (AC or DC and the voltage), how you will wire it in the cabinet and your country's plug standard, and we confirm the exact connector and supply version of the EMS-200 for your order.
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