Manufacturer product photo · 1T (left) and 2T (right) DIN-rail serial device server variants
ZJTS804D
Serial Device Server · 4×RS-232/485 · DIN-Rail
Industrial DIN-Rail Serial Device Server · 4×RS-232/485 · 1 or 2×10/100M Ethernet · DC5V (5–24V)
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◆4×RS-232/485
◆1 or 2×Ethernet
◆DIN-Rail Mount
◆DC5V Wide Range
◆15KV ESD Protection
◆5-Year Warranty
Overview
The ZJTS804D is an industrial DIN-rail serial device server that bridges 4 × RS-232/485 serial devices onto an Ethernet network. It offers 1 or 2 × 10/100M auto-adaptive Ethernet ports, WEB-browser remote configuration, and built-in 15KV ESD surge protection on every serial port. Powered by DC5V (5–24V wide-range DC input) with reverse-polarity and overload protection, in a compact 135×117×50mm metal enclosure for DIN-rail or wall mounting, it is built for cabinets that need to connect legacy serial equipment to an Ethernet network.
Is This the Right Fit?
Six real deployment scenarios matched to this model's actual datasheet specifications.
Legacy Serial Equipment to Ethernet4 independent RS-232/485 serial ports let PLCs, meters, and other legacy serial-only equipment reach a standard 10/100M Ethernet network — no rewiring of the serial side required.
Electrical Cabinet DIN-Rail MountDefault DIN-rail mounting plus DC5V wide-range 5–24VDC input with reverse-polarity/overload protection fits directly inside control cabinets and junction boxes — the only DIN-rail form factor in this serial-server family.
PLC Automation Cell IntegrationBuilt-in Modbus TCP/IP support lets RS-232/485 PLCs and automation controllers bridge directly onto an Ethernet-based SCADA/HMI network alongside DHCP, Telnet, TCP/UDP and ARP.
Outdoor / Unheated Cabinet DeploymentAn optional wide-temperature version rated -40 to 75°C (vs. -10 to 60°C standard) keeps the serial link running in unheated outdoor cabinets and cold climates.
Choose 1 or 2 Ethernet UplinksSold as -1T (a single 10/100M Ethernet port) or -2T (two 10/100M Ethernet ports) — pick the 2-port SKU when the cabinet needs a second Ethernet connection point without adding a separate switch.
Surge-Prone Field Wiring ProtectionAll 4 serial ports carry built-in 15KV ESD surge protection, guarding against lightning-induced or electrostatic transients common on long field serial cable runs.
Not a good fit if:
- Not a network switch — 1 or 2 Ethernet ports only bridge serial traffic to IP; no VLAN/RSTP/ring-network switching between multiple LAN devices.
- IP40 enclosure only — needs a cabinet or additional protection for direct outdoor rain/dust exposure.
- DC5V (5–24VDC) power only — no AC220V option on this series; sites with only AC mains need a separate DC5V power adapter.
Key Features
- 1 or 2 × 10/100M auto-adaptive Ethernet port(s) for fast serial-to-network connectivity
- High-performance 32-bit 100MHz processor with ample memory
- Remote parameter configuration via WEB browser over the network
- Built-in 15KV ESD surge protection on all serial ports
- Intuitive bilingual Chinese/English configuration menu for easier setup
- Flexible RS-232/485 serial port combination
- Custom terminal-block power connector available for easy wiring
- DIN-rail or wall-mount installation
Specifications
Performance
| CPU | 32-bit 100MHz |
| Memory | 2MB |
| Ethernet Rate | 10/100Mbps auto-adaptive, manual setting supported |
| Communication Mode | 10M half/full duplex, 100M half/full duplex |
| Port Protection | 15KV electromagnetic isolation |
Serial & Ethernet Interface
| RJ45 Ethernet | Up to 2×10/100Base-T(X) — 1 or 2 ports selectable (-1T/-2T) |
| Serial Ports | 4 × RS-232/485 |
| Connector Type | Terminal block / DB-9 |
| RS-232 Signal | TxD, RxD, GND |
| RS-485 Signal (2-wire) | Data+, Data-, GND |
| Data Bits | 5, 6, 7, 8 |
| Parity | None, Even, Odd, Space, Mark |
| Stop Bits | 1, 2 |
| Flow Control | RTS/CTS, XON/XOFF |
| Baud Rate | 300bps – 230.4Kbps |
| Protocols | DHCP, Telnet, TCP, UDP, IP, ICMP, ARP, Modbus TCP/IP |
| Virtual COM Driver | Windows NT/2000/XP/Vista/7/10/11 |
Power
| DC Input | DC5V, supports 5–24VDC range |
| Power Consumption | Max 4 W |
| Power Protection | Reverse-polarity & overload protection |
| Other Power Options | None — DC5V (5–24V) only, no AC220V option on this series |
Environment
| Standard Temp | -10 ~ 60°C |
| Wide Temp (optional) | -40 ~ 75°C |
| Storage Temp | -40 ~ 85°C |
| Humidity | 5–95% non-condensing |
Physical
| Housing | IP40 metal enclosure |
| Mounting | Wall-mount / DIN-rail |
| Dimensions | 135 (H) × 117 (D) × 50 (W) mm |
Certification
| EMC | CE, FCC |
| EMI | FCC Part 15, EN 55032 (CISPR 32) Class A |
| EMS | EN61000-4-2/3/4/5/6/8 Level 3 |
| Shock | IEC60068-2-27 |
| Free Fall | IEC60068-2-32 |
| Vibration | IEC60068-2-6 |
| Green | RoHS, WEEE |
Reliability
| MTBF | 320,000 hours |
| Warranty | 5 years |
Models & Ordering
| Model | Product Description | Price |
|---|---|---|
| ZJTS804D-1T-S-232 | 4-port RS-232 serial device server, 1×10/100M auto-adaptive Ethernet port, DIN-rail mount, DC5V (5–24V) power. | |
| ZJTS804D-1T-S-485 | 4-port RS-485 serial device server, 1×10/100M auto-adaptive Ethernet port, DIN-rail mount, DC5V (5–24V) power. | |
| ZJTS804D-1T-M | 4-port RS-232/485 combo serial device server, 1×10/100M auto-adaptive Ethernet port, DIN-rail mount, DC5V (5–24V) power. | |
| ZJTS804D-2T-S-232 | 4-port RS-232 serial device server, 2×10/100M auto-adaptive Ethernet ports, DIN-rail mount, DC5V (5–24V) power. | |
| ZJTS804D-2T-S-485 | 4-port RS-485 serial device server, 2×10/100M auto-adaptive Ethernet ports, DIN-rail mount, DC5V (5–24V) power. | |
| ZJTS804D-2T-M | 4-port RS-232/485 combo serial device server, 2×10/100M auto-adaptive Ethernet ports, DIN-rail mount, DC5V (5–24V) power. |
Model code: -1T = 1×10/100M Ethernet port, -2T = 2×10/100M Ethernet ports; -S-232 = 4×RS-232 only, -S-485 = 4×RS-485 only, -M = RS-232/RS-485 combo (selectable per port). All 6 SKUs share the same DC5V (5–24V) power input and DIN-rail housing; a wide-temperature (-40~75°C) option is available on request.
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 install it
Written for the ZJTS804D series from its own datasheet: DIN-rail, 4 × RS-232/485 serial ports, 300 bps to 230.4Kbps, 1 or 2 × 10/100M Ethernet (-1T/-2T), TCP/UDP and Modbus TCP/IP, virtual COM driver, DC5V (5–24VDC) input, max 4 W.
Who it is for
- Panel builders and control-cabinet OEMs — It is the only DIN-rail model in the ZJTS family and runs from the cabinet's own 5–24VDC supply, so it snaps in beside the PLC and power supply with no separate adapter.
- Utilities, pump stations and water treatment — Flow meters, level transmitters and RTUs on RS-485 reach the SCADA over Modbus TCP/IP; the wide-temperature version (-40 ~ 75°C) suits unheated field cabinets running on a 12 V or 24 V battery-backed supply.
- Factories with chained cabinets — The -2T version has two 10/100M Ethernet ports, giving a second connection point in the cabinet (for example a local HMI or laptop) without adding a small switch.
- Building automation integrators — Four ports cover typical riser cabinets with an energy-meter bus, a chiller or boiler controller and an access-control panel, all configured through the same web page.
Where and how to install
- On the DIN rail — The housing is 135 × 117 × 50 mm, so it takes 50 mm of rail and needs about 135 mm of height between wiring ducts. Mount it upright with the serial terminals toward the field-wiring duct and keep it away from VFDs and contactor coils; wall mounting is the alternative.
- DC power from the cabinet supply — Input is DC only, 5–24VDC, with reverse-polarity and overload protection and max 4 W. Wire it from the 12 V or 24 V DIN-rail power supply through its own small fuse or breaker; on AC-only sites add a DIN-rail DC supply, since there is no AC220V option on this series.
- Serial connectors and wiring — Serial connectors are listed as terminal block or DB-9, so confirm which one your version has before making cables. RS-232 uses TxD, RxD, GND; RS-485 is 2-wire Data+, Data-, GND on shielded twisted pair, with the same polarity on every device.
- Bus length and termination — As general practice, keep RS-232 runs to about 15 m; RS-485 can run up to about 1200 m at low baud rates, less at 115.2K or 230.4K. Wire RS-485 as a daisy chain, not a star, and fit 120 Ω termination only at the two far ends of each bus.
- Grounding, surge and condensation — Serial ports have 15KV ESD protection and the unit is tested to EN61000-4 Level 3, but galvanic isolation is not listed: bond the cabinet to earth and add RS-485 surge protectors where cables leave the building. IP40 housing, so use a closed cabinet outdoors; standard -10 ~ 60°C, wide -40 ~ 75°C, 5–95% non-condensing, with a heater or vent in humid cabinets.
Link planning: which ZJTS804D version
Six versions: pick the serial type (-S-232, -S-485 or -M) and then 1 or 2 Ethernet ports (-1T or -2T). Everything else, including the DC5V (5–24VDC) input and the DIN-rail housing, is the same.
| ZJTS804D-1T/2T-S-232 | ZJTS804D-1T/2T-S-485 | ZJTS804D-1T/2T-M | |
|---|---|---|---|
| Serial ports | 4 × RS-232 | 4 × RS-485 (2-wire) | 4 × RS-232/485 (2-in-1) |
| Signals | TxD, RxD, GND | Data+, Data-, GND | TxD, RxD, GND / Data+, Data-, GND |
| Typical cable length (general practice) | ~15 m | up to ~1200 m at low baud | ~15 m / up to ~1200 m |
| Baud rate | 300 bps – 230.4Kbps | 300 bps – 230.4Kbps | 300 bps – 230.4Kbps |
| Ethernet ports | -1T: 1 × 10/100M · -2T: 2 × 10/100M | -1T: 1 × 10/100M · -2T: 2 × 10/100M | -1T: 1 × 10/100M · -2T: 2 × 10/100M |
| Protocols | TCP, UDP, Modbus TCP/IP, DHCP, Telnet | TCP, UDP, Modbus TCP/IP, DHCP, Telnet | TCP, UDP, Modbus TCP/IP, DHCP, Telnet |
| Virtual COM driver | Windows NT/2000/XP/Vista/7/10/11 | Windows NT/2000/XP/Vista/7/10/11 | Windows NT/2000/XP/Vista/7/10/11 |
| Power input / consumption | 5–24VDC only; max 4 W | 5–24VDC only; max 4 W | 5–24VDC only; max 4 W |
| Operating temperature | -10 ~ 60°C (wide -40 ~ 75°C) | -10 ~ 60°C (wide -40 ~ 75°C) | -10 ~ 60°C (wide -40 ~ 75°C) |
| Mounting / size | DIN rail/wall, 135×117×50 mm | DIN rail/wall, 135×117×50 mm | DIN rail/wall, 135×117×50 mm |
- Pick -1T when the cabinet already has a switch port for it; pick -2T when a local HMI, laptop or second device needs a network socket in the same cabinet.
- Pick -S-485 for meter and transmitter buses, -S-232 for point-to-point devices within about 15 m, and -M for a mixed cabinet.
Specifications from the ZJTS804D manufacturer datasheet. Cable lengths are general RS-232/RS-485 practice, not datasheet values.
DIN-Rail Serial Device Server FAQ — ZJTS804D
What is the difference between the -1T and -2T versions?
The Ethernet port count. The -1T build has 1 × 10/100Base-T(X) port; the -2T build has 2, both auto-adaptive 10/100Mbps with manual setting supported. Serial capacity is identical — 4 × RS-232/485 on terminal block or DB-9 connectors — so choose -2T when you want a second network connection.
How does the ZJTS804D mount inside a cabinet?
It clips onto a standard DIN rail or screws to a wall — the compact 135×117×50 mm IP40 metal enclosure fits alongside breakers and PLC modules in the same cabinet. That makes it the natural pick over desktop models when the serial equipment already lives in a control cabinet.
What power input does it need? Is there an AC version?
This series is DC-only: DC5V nominal with a wide 5–24VDC input range, drawing 4 W maximum, with reverse-polarity and overload protection. There is no AC220V option on the ZJTS804D — if you need mains AC input, look at the desktop ZJTS804 instead, which offers both.
How is each serial port protected against surges?
Every serial port carries built-in 15KV ESD surge protection with electromagnetic isolation, and the unit meets EN61000-4-2/3/4/5/6/8 at Level 3 plus IEC60068 shock, free-fall and vibration standards. That protects RS-485 field buses running near motors, contactors and long outdoor cable runs.
Which protocols and configuration methods does it support?
Configuration is remote via WEB browser; protocols include DHCP, Telnet, TCP, UDP, IP, ICMP, ARP and Modbus TCP/IP. The Windows virtual COM driver (NT through 11) maps the 4 remote serial ports to local COM numbers. Serial side: 300 bps–230.4 Kbps, data bits 5–8, five parity modes, RTS/CTS and XON/XOFF flow control.
Can the ZJTS804D connect Modbus RTU meters to a SCADA that speaks Modbus TCP?
Modbus TCP/IP is in its protocol list, so this is the intended use: the SCADA polls the ZJTS804D over Ethernet and the unit forwards the requests to the RTU devices on its serial ports. The datasheet does not describe the gateway settings in detail (slave ID routing, response timeout), so send us your SCADA and meter models and we will confirm the setup before you order. If your software only speaks Modbus RTU on a COM port, use the virtual COM driver instead.
Which Windows versions does the ZJTS804D virtual COM driver support, and how many COM ports will I get?
The datasheet lists Windows NT/2000/XP/Vista/7/10/11. Each of the 4 serial ports is mapped to its own COM number on the PC, so software written for a local COM port keeps working without changes. Linux and macOS drivers are not listed; on those systems, or for new software, connect over TCP/UDP or Modbus TCP/IP instead of a virtual COM port. Ask us for the current driver and setup tool when you order.
How many RS-485 devices can I connect to each ZJTS804D port, and how long can the cable be?
The datasheet does not give a node limit or distance. As general RS-485 practice, plan up to 32 standard unit loads per bus and up to about 1200 m at 9600 bps, wired as a daisy chain with 120 Ω termination at both ends. With 4 ports, spreading devices over separate buses (for example by floor or by pump) keeps each poll cycle short and isolates a wiring fault to one bus.
Will polling through the ZJTS804D be slower than a direct serial cable?
Slightly: the datasheet gives no latency figure, but every request now also crosses the Ethernet network and the unit's buffer, which on a local LAN usually adds only a few milliseconds compared with the serial transmission itself. Over Wi-Fi, VPN or 4G links the delay can be much larger, so raise the response timeout in your SCADA or software (for example from 100 ms to 500–1000 ms) and avoid two masters polling the same port at the same time. Use the highest baud rate all devices on the bus support to shorten each poll.
Can the two Ethernet ports on the ZJTS804D-2T give me network redundancy?
Do not plan on it: the datasheet lists up to 2 × 10/100Base-T(X) but no ring, RSTP, failover or dual-IP function, and our page describes it as a serial gateway, not a switch. Use the second port as an extra connection point in the cabinet. If the link must survive a cable or switch failure, connect the ZJTS804D to an industrial ring switch and power it from a battery-backed DC supply; tell us your topology and we will confirm before you order.
When should I pick the ZJTS804D over the desktop ZJTS804?
Both have 4 RS-232/485 ports, the same baud range and protocols, max 4 W. Pick the ZJTS804D for DIN-rail cabinets with a 12 V or 24 V DC supply, or when you need a second Ethernet port (-2T). Pick the ZJTS804 when the unit sits on a desk or wall and you want to feed it directly from 85–264VAC, which the ZJTS804D cannot take.
What power connector does the ZJTS804D Series 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 ZJTS804D Series for your order.
Ordering questions — samples, shipping, payment, lead time and genuine stock — are answered once on our FAQ page.
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