Manufacturer product photo · industrial 4-port serial device server
ZJTS804
Industrial Serial Device Server · 4×RS-232/485
Industrial 4-Port RS-232/485 Serial Device Server · Modbus TCP/IP · DC5V/AC220V
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◆Serial Device Server
◆4 × RS-232/485 Ports
◆Desktop / Wall-Mount
◆DC5V / AC220V
◆-40~75°C Option
◆5-Year Warranty
Overview
The ZJTS804 is an industrial serial device server that supports up to 4 RS-232/485 serial ports in flexible combinations, bridging legacy serial equipment to 10/100M Ethernet networks with remote WEB-browser configuration. It is powered by DC5V (5–24V wide range, via optional 220V-to-5V adapter) or AC220V (85–264VAC/77–300VDC), drawing a maximum of 4 W with reverse-polarity and overload protection, and is available in a standard -10~60°C or wide-temperature -40~75°C version. Housed in a compact IP40 metal enclosure for desktop or wall-mount installation, it carries a 5-year warranty.
Is This the Right Fit?
Six real deployment scenarios matched to this model's actual datasheet specifications.
Legacy Serial Equipment onto the NetworkUp to 4 RS-232/485 serial ports in flexible combination bridge legacy instruments, PLCs, and meters onto a 10/100M Ethernet network for remote access.
PLC & Automation Cell IntegrationBuilt-in Modbus TCP/IP support alongside DHCP/Telnet/TCP/UDP/ICMP/ARP lets PLCs and SCADA systems poll serial field devices directly over standard Ethernet.
Desktop Plug-and-Play DeploymentCompact 30×106×160 mm metal desktop/wall-mount enclosure needs no rack or cabinet — connect power and Ethernet and the unit is online.
Wide-Temperature Outdoor / Unheated CabinetThe optional wide-temperature version operates from -40 to 75°C (storage to -40~85°C), suited to unheated outdoor cabinets facing cold winters and hot summers.
Mid-Scale Multi-Device Serial Consolidation4 independent RS-232/485 ports — double the port count of the 2-port ZJTS802 — let one unit consolidate several serial instruments, PLCs, or meters at a single network drop, right-sized between single-device and 8/16-port rack units.
Long-Run RS-485 Field Wiring Surge ImmunityBuilt-in 15KV ESD protection on all 4 serial ports, plus EN61000-4 series Level 3 EMC immunity, guards against lightning-induced surges and EMI picked up along long RS-485 field cable runs to remote instruments.
Not a good fit if:
- Single 10/100M Ethernet uplink port only — not a multi-port network switch; use a separate switch for LAN fan-out.
- Single, non-redundant DC5V or AC220V power input per SKU — no dual/redundant power option in this datasheet.
- IP40 enclosure only — needs a cabinet or additional protection for direct outdoor rain/dust exposure.
Key Features
- 10/100M auto-negotiating Ethernet port for fast networking of serial devices
- High-performance processor with large-capacity memory
- Remote parameter configuration over the network via WEB browser
- Built-in 15KV ESD surge protection on all serial ports
- Intuitive Chinese/English menu setup interface simplifies installation and configuration
- RS-232/485 serial ports can be flexibly combined
- Custom products available with terminal-block power connector for easy wiring
- Desktop or wall-mount installation
Specifications
Performance
| CPU | 32-bit 100MHz |
| Memory | 2MB |
| Ethernet Rate | 10/100Mbps auto-negotiation, manual setting supported |
| Communication Mode | 10M half/full duplex, 100M half/full duplex |
| Port Protection | 15KV electromagnetic isolation |
Serial Interface
| Serial Ports | 4 × RS-232/485 |
| Port Connector | RS-232/485 terminal block |
| 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 to 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
| 5V Input | Optional 220V-to-5V power adapter, support range 5–24VDC |
| 220V Input | 3-pin terminal; 220V support range 85–264VAC/77–300VDC |
| Power Consumption | Max 4 W |
| Power Protection | Reverse-polarity & overload |
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 | Wall-mount / desktop |
| Dimensions | 30 (H) × 106 (D) × 160 (W) mm |
Certification
| EMC | CE, FCC |
| EMI | FCC Part 15, EN 55032 (CISPR 32) Class A |
| EMS | EN61000-4-2 (ESD) Level 3, EN61000-4-3 (RS) Level 3, EN61000-4-4 (EFT) Level 3, EN61000-4-5 (Surge) Level 3, EN61000-4-6 (CS) Level 3, EN61000-4-8 |
| 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 |
|---|---|---|
| ZJTS804-S-232 | Industrial 4-port RS232 serial device server, desktop/wall-mount installation, AC220V powered, optional 220V-to-5V (5–24V range) power adapter. | |
| ZJTS804-S-485 | Industrial 4-port RS485 serial device server, desktop/wall-mount installation, AC220V powered, optional 220V-to-5V (5–24V range) power adapter. | |
| ZJTS804-M | Industrial 4-port RS232/485 (2-in-1) serial device server, desktop/wall-mount installation, AC220V powered, optional 220V-to-5V (5–24V range) power adapter. |
This page covers the ZJTS804 series (4-port desktop/wall-mount serial device server): -S-232 = RS-232 only; -S-485 = RS-485 only; -M = RS-232/485 combo (2-in-1), port type selectable. All three SKUs are AC220V powered with an optional 220V-to-5V (5–24V range) DC power adapter. The requested model is ZJTS804.
Dimensions
unit: mm
Your Brand. Factory-Direct Supply.Neutral casing, ready for your logo · Custom port/power/fiber options · Small batches welcome.
Custom & OEM →Who uses it, where it goes and how to install it
Written for the ZJTS804 series from its own datasheet: 4 × RS-232/485 serial ports, 300 bps to 230.4Kbps, 1 × 10/100M Ethernet, TCP/UDP and Modbus TCP/IP, virtual COM driver, 5–24VDC or 85–264VAC power, max 4 W, desktop/wall mount, 30 × 106 × 160 mm.
Who it is for
- Electrical rooms and substation metering — With the -S-485 version, four separate RS-485 buses (for example one per switchboard or feeder group) go onto the LAN through one network drop, so a slow or faulty meter on one bus does not hold up the others.
- Machine cells and small production lines — Up to 4 serial devices at one station, such as a PLC, an HMI, a weighing indicator and a barcode printer, become reachable from the plant network; the -M version mixes RS-232 and RS-485 devices.
- Remote sites in unheated cabinets — Pump stations, telecom huts or weather stations: the wide-temperature version runs at -40 ~ 75°C, and the 5–24VDC input can share a 12 V or 24 V battery-backed supply.
- System integrators standardising on one size — Four ports is double the ZJTS802 and covers most small panels without moving to the 8-port ZJTS808; the same web configuration and virtual COM driver are used across the ZJTS family.
Where and how to install
- Wall or shelf in the panel — Mounting is desktop or wall-mount; there is no DIN-rail option on this model (choose the ZJTS804D for DIN rail). Screw it to the back plate of the panel with the terminal side facing the wiring duct, and leave space to tighten the 4 serial terminals.
- Serial wiring per port — Each port is a terminal block: RS-232 TxD, RxD, GND, or RS-485 2-wire Data+, Data-, GND. Label the 4 cables with the port number, use shielded twisted pair for RS-485 with the shield grounded at one end, and keep the same Data+/Data- 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.
- Power — Feed either the 5V input (5–24VDC, e.g. the optional 220V-to-5V adapter or the panel's 12 V/24 V supply) or the 3-pin 220V terminal (85–264VAC / 77–300VDC). There is a single power input, not a redundant pair, so for a critical cabinet put it on a UPS or a battery-backed DC supply; max 4 W.
- Surge, ESD and environment — All 4 serial ports have 15KV ESD protection and the unit is tested to EN61000-4-5 surge Level 3, but galvanic isolation is not listed: RS-485 lines that run outdoors or between buildings still need an external surge protector or isolator and a good ground. IP40 metal housing for indoor or closed cabinets; standard -10 ~ 60°C, wide -40 ~ 75°C, 5–95% non-condensing.
Link planning: which ZJTS804 version
All three versions have 4 serial ports, the same Ethernet, power and 30 × 106 × 160 mm housing; only the serial interface type changes.
| ZJTS804-S-232 | ZJTS804-S-485 | ZJTS804-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 |
| Network side | 1 × 10/100M; TCP, UDP, Modbus TCP/IP | 1 × 10/100M; TCP, UDP, Modbus TCP/IP | 1 × 10/100M; TCP, UDP, Modbus TCP/IP |
| 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 or 85–264VAC; max 4 W | 5–24VDC or 85–264VAC; max 4 W | 5–24VDC or 85–264VAC; 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 | Desktop/wall, 30×106×160 mm | Desktop/wall, 30×106×160 mm | Desktop/wall, 30×106×160 mm |
- Pick -S-485 when you have up to 4 meter or sensor buses; one bus per port keeps poll cycles short.
- Pick -S-232 for up to 4 point-to-point devices within about 15 m, such as scales, printers or instrument consoles.
- Pick -M for a mixed panel, and the ZJTS804D instead if you need DIN rail or a second Ethernet port.
Specifications from the ZJTS804 manufacturer datasheet. Cable lengths are general RS-232/RS-485 practice, not datasheet values.
4-Port Serial Device Server FAQ — ZJTS804
How many serial devices can the ZJTS804 bring online?
Up to 4 RS-232/485 ports in flexible combinations, bridged onto a 10/100M auto-negotiating Ethernet network. Each port is independently configurable — data bits 5–8, five parity modes, 1–2 stop bits, 300 bps to 230.4 Kbps — so mixed legacy equipment can share one gateway.
Can I configure it remotely without visiting the site?
Yes — configuration is done remotely through a WEB browser, plus Telnet access over the network. Protocol support covers DHCP, TCP, UDP, IP, ICMP, ARP and Modbus TCP/IP, and the virtual COM driver for Windows NT through 11 maps each port to a local COM number for your existing software.
What are the power supply options and consumption?
Either DC5V with a 5–24V wide input range (via an optional 220V-to-5V adapter) or AC220V accepting 85–264VAC / 77–300VDC on a 3-pin terminal. Maximum draw is only 4 W, and reverse-polarity and overload protection are standard, so it tolerates rough cabinet wiring.
Does it survive electrically noisy industrial sites?
Yes. Every serial port has 15KV electromagnetic isolation, and the unit passes EN61000-4-2 (ESD), -4-3 (RS), -4-4 (EFT), -4-5 (Surge) and -4-6 (CS) at Level 3, plus IEC60068 shock, free-fall and vibration tests. MTBF is rated at 320,000 hours with a 5-year warranty.
What temperature versions and mounting options exist?
The standard build runs -10 to +60°C; a wide-temperature version covers -40 to +75°C, with storage rated -40 to +85°C and 5–95% non-condensing humidity. The IP40 metal enclosure measures 30×106×160 mm and installs on a desktop or wall — no rack space needed.
Can the ZJTS804 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 ZJTS804 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 ZJTS804 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 meters can I put on each ZJTS804 port, and how far can the bus run?
The datasheet gives no 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, with 120 Ω termination at both ends of the daisy chain. With 4 ports you can run 4 such buses, for example 4 × 20 meters, which also makes each poll cycle about four times shorter than one bus of 80. At 9600 bps with 8N1 each byte takes about 1.04 ms, so keep long or busy buses at the lower baud rates and short buses at the higher ones.
Will polling through the ZJTS804 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.
Should I choose the ZJTS804 or the DIN-rail ZJTS804D?
Both have 4 RS-232/485 ports, 300 bps to 230.4Kbps and the same protocols. Choose the ZJTS804 for desk or wall mounting and when you want to power it directly from 85–264VAC; choose the ZJTS804D for a DIN-rail cabinet, when you need terminal or DB-9 serial connectors, or a second 10/100M Ethernet port (-2T versions). The ZJTS804D is DC powered only (5–24VDC).
What power connector does the ZJTS804 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 ZJTS804 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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