Product photo · compact 2-port desktop serial device server
ZJTS802
Serial Device Server · 2-Port RS-232/485
Industrial 2-Port RS-232/485 Serial Device Server · Desktop/Wall-Mount · DC5V or AC220V
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◆2×RS-232/485 Serial Ports
◆10/100M Ethernet
◆15KV ESD Protection
◆IP40 Metal · 23×112×77mm
◆-40~75°C Wide Temp Optional
◆5-Year Warranty
Overview
The ZJTS802 series is an industrial serial device server (serial-to-Ethernet gateway) that connects up to 2 RS-232/485 serial ports to a 10/100M Ethernet network, letting legacy serial equipment go online without replacement. It mounts on a desktop or wall, and is powered by DC5V (via an optional 220V-to-5V adapter, 5-24VDC input range) or by AC220V through a 3-pin terminal (85-264VAC/77-300VDC), with reverse-polarity and overload protection built in. An optional wide-temperature version extends operation to -40~75°C, and the compact IP40 metal enclosure with strong EMC immunity suits industrial environments.
Is This the Right Fit?
Six real deployment scenarios matched to this model's actual datasheet specifications.
Bring Legacy Serial Equipment Online2 × RS-232/485 serial ports let you convert legacy serial-only PLCs, meters, and sensors to 10/100M Ethernet (legacy serial to IP) without replacing the device.
PLC & Automation Cell NetworkingBuilt-in Modbus TCP/IP protocol support lets both serial ports bridge PLC/automation controllers straight into the plant Ethernet.
Desktop Plug-and-Play DeploymentCompact 23(H)×112(D)×77(W) mm desktop or wall-mount enclosure needs no rack or DIN-rail — place it next to the device and connect.
Outdoor / Extreme-Temperature CabinetsAn optional wide-temperature version operates from -40 to 75°C for unheated cabinets and outdoor enclosures.
Smallest Model in the ZJTS Family — Single-Point RetrofitAt 23×112×77mm this is the most compact model in the ZJTS802/804/804D/808/816/832 line — sized for a single 2-port serial-to-Ethernet retrofit at one desk or panel.
ESD & Surge-Prone Industrial SitesAll serial ports carry built-in 15KV ESD surge protection inside an IP40 metal enclosure, guarding against static discharge from cabling and handling.
Not a good fit if:
- Only 2 serial ports per unit — for higher port-count serial fleets, see the larger ZJTS804/804D/808/816/832 models in this series.
- IP40 enclosure only — not rated for outdoor direct-exposure or washdown environments; use an external cabinet outdoors.
- Single 10/100M Ethernet uplink with no VLAN/ring-network switching features — this is a serial gateway, not a managed switch.
Key Features
- 10/100M adaptive Ethernet port for fast networking of serial devices
- High-performance processor with large memory capacity
- Remote parameter configuration via web browser over the network
- Built-in 15KV ESD surge protection on all serial ports
- Intuitive bilingual Chinese/English menu interface for simpler setup
- RS-232/485 serial ports can be flexibly combined
- Custom products available · terminal-block power connector for easy wiring
- Desktop / wall-mount installation
Specifications
Performance
| CPU | 32-bit, 100MHz |
| Memory | 2MB |
| Ethernet Rate | 10/100Mbps adaptive, manual setting supported |
| Communication Mode | 10M half/full duplex, 100M half/full duplex |
| Port Protection | 15KV electromagnetic isolation |
Serial Port
| Serial Ports | 2 × RS-232/485 |
| Port Connector | RS-232/485 terminal block |
| Signal (RS-232) | TxD, RxD, GND |
| Signal (RS-485 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 |
| Protocol | 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, input range 5–24VDC |
| 220V Input | 3-pin terminal; 220V input range 85–264VAC / 77–300VDC |
| Power Consumption | Max 4W |
| Power Protection | Reverse-polarity & overload protection |
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 | Desktop / wall-mount |
| Dimensions | 23 (H) × 112 (D) × 77 (W) mm |
Certification
| EMC | CE, FCC |
| EMI | FCC Part 15, EN 55032 (CISPR 32) Class A |
| EMS | EN61000-4-2 (ESD) Level3, EN61000-4-3 (RS) Level3, EN61000-4-4 (EFT) Level3, EN61000-4-5 (Surge) Level3, EN61000-4-6 (CS) Level3, EN61000-4-8 |
| Shock | IEC60068-2-27 |
| Free Fall | IEC60068-2-32 |
| Vibration | IEC60068-2-6 |
| Green | RoHS, WEEE |
Warranty
| MTBF | 320,000 hours |
| Warranty | 5 years |
Models & Ordering
| Model | Product Description | Price |
|---|---|---|
| ZJTS802-S-232 | 2-port RS-232 serial device server, desktop/wall-mount, AC220V powered, optional 220V-to-5V (5–24V) power adapter. | |
| ZJTS802-S-485 | 2-port RS-485 serial device server, desktop/wall-mount, AC220V powered, optional 220V-to-5V (5–24V) power adapter. | |
| ZJTS802-M | 2-port RS-232/485 combo serial device server, desktop/wall-mount, AC220V powered, optional 220V-to-5V (5–24V) power adapter. |
All three ZJTS802 variants share identical performance, power, and physical specifications per the datasheet; they differ only in serial port protocol — RS-232 (-S-232), RS-485 (-S-485), or RS-232/485 combo (-M).
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 ZJTS802 series from its own datasheet: 2 × 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 4W, desktop/wall mount.
Who it is for
- Energy metering and building management — Put an RS-485 bus of power meters or a BMS controller on the LAN with the -S-485 version; two ports let you split meters onto two buses or keep one port for a second device type.
- Factories with one or two legacy machines — A PLC, scale, barcode printer or CNC controller with only an RS-232 port can be reached from a PC over Ethernet; the -M version mixes one RS-232 and one RS-485 device on the same unit.
- Software that only talks to a COM port — Old configuration or data-logging programs keep working: the virtual COM driver for Windows NT/2000/XP/Vista/7/10/11 maps each serial port to a COM number on the PC.
- Integrators doing single-point retrofits — At 23 × 112 × 77 mm it is the smallest ZJTS model and fits beside the device on a desk, wall or panel, without a rack or DIN rail.
Where and how to install
- Desk, wall or inside a panel — Mounting is desktop or wall only (no DIN-rail clip is listed; for DIN rail look at the ZJTS804D). Fix it inside the control panel next to the serial device so the RS-232 lead stays short, and keep it away from contactors and VFD output cables.
- Serial wiring on the terminal block — Both ports are terminal blocks: RS-232 uses TxD, RxD, GND (cross TxD/RxD to the device) and RS-485 is 2-wire Data+, Data-, GND. Use shielded twisted pair for RS-485, keep the same Data+/Data- polarity on every device and connect the GND reference.
- 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 — Use the 5V input (5–24VDC, e.g. the optional 220V-to-5V adapter or an existing 12 V or 24 V panel supply) or the 3-pin 220V terminal (85–264VAC / 77–300VDC). Consumption is max 4W, so a small supply is enough; reverse-polarity and overload protection are built in.
- Surge, ESD and environment — Serial ports have 15KV ESD protection and the unit is rated EN61000-4-5 surge Level 3, but galvanic isolation of the serial ports is not listed: for RS-485 lines that leave the building add an external surge protector or isolator and a good ground. IP40 housing: indoor or closed cabinet only; standard -10 ~ +60°C, wide-temperature version -40 ~ +75°C, 5–95% non-condensing.
Link planning: which ZJTS802 version
The three versions share the same CPU, Ethernet, power and housing; they differ only in the serial interface type of the 2 ports.
| ZJTS802-S-232 | ZJTS802-S-485 | ZJTS802-M | |
|---|---|---|---|
| Serial ports | 2 × RS-232 | 2 × RS-485 (2-wire) | 2 × RS-232/485 combo |
| 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 RJ45; TCP, UDP, Modbus TCP/IP | 1 × 10/100M RJ45; TCP, UDP, Modbus TCP/IP | 1 × 10/100M RJ45; 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 4W | 5–24VDC or 85–264VAC; max 4W | 5–24VDC or 85–264VAC; max 4W |
| 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, 23×112×77 mm | Desktop/wall, 23×112×77 mm | Desktop/wall, 23×112×77 mm |
- Pick -S-232 when both devices sit within a few meters (PLC programming port, scale, printer).
- Pick -S-485 for meter, inverter or sensor buses that run across a plant room or several floors.
- Pick -M when you are not sure yet or have one device of each type.
Specifications from the ZJTS802 manufacturer datasheet. Cable lengths are general RS-232/RS-485 practice, not datasheet values.
Serial Device Server FAQ — ZJTS802
What does the ZJTS802 actually do?
It is a serial-to-Ethernet gateway: it connects up to 2 RS-232/485 serial ports to a 10/100M Ethernet network, so legacy serial equipment goes online without being replaced. It speaks DHCP, Telnet, TCP, UDP, IP, ICMP, ARP and Modbus TCP/IP, and mounts on a desktop or wall.
What serial settings does it support?
Baud rates from 300 bps to 230.4 Kbps; data bits 5, 6, 7 or 8; parity None, Even, Odd, Space or Mark; 1 or 2 stop bits; RTS/CTS and XON/XOFF flow control. Ports connect via terminal block — RS-232 uses TxD/RxD/GND, 2-wire RS-485 uses Data+/Data-/GND.
How do I power the ZJTS802?
Two options: DC5V via an optional 220V-to-5V adapter, accepting a wide 5–24VDC input range, or AC220V through a 3-pin terminal that tolerates 85–264VAC / 77–300VDC. Consumption is 4 W maximum, and reverse-polarity plus overload protection are built in — miswiring the supply will not kill it.
Will my Windows software see the serial devices as local COM ports?
Yes. The virtual COM driver supports Windows NT, 2000, XP, Vista, 7, 10 and 11, mapping each remote serial port to a local COM number so existing SCADA or metering software keeps working unchanged. Networking runs over TCP, UDP and Modbus TCP/IP on the 10/100Mbps adaptive Ethernet port.
How rugged is it for factory or outdoor cabinet use?
Each port carries 15KV electromagnetic isolation, and EMC immunity meets EN61000-4-2/3/4/5/6 Level 3. Standard models run -10 to +60°C; an optional wide-temperature version extends that to -40 to +75°C. The IP40 metal housing measures 23×112×77 mm, MTBF is 320,000 hours, and warranty is 5 years.
Can the ZJTS802 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 ZJTS802 over Ethernet and the unit forwards the requests to the RTU devices on its serial port. 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.
How many RS-485 meters or PLCs can I connect to one ZJTS802 port?
The datasheet gives no node limit. As general RS-485 practice a standard driver handles 32 unit loads, so up to about 32 standard devices per bus (more if your devices are 1/4 or 1/8 unit load), each with its own Modbus address. In practice the polling time sets the limit: at 9600 bps with 8N1 each byte takes about 1.04 ms, so 30 meters read one after another can take several seconds per cycle. With 2 ports you can split the devices over two buses to halve the cycle.
Will polling through the ZJTS802 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.
How do I find and set up the ZJTS802 on my network the first time?
Configuration is through a web browser over the network, with a Chinese/English menu, and Telnet and DHCP are also supported. The factory default IP address is not printed on our page, so we send it with the unit; connect a PC directly or through a switch, set the PC to the same subnet, open the web page and then set a fixed IP for the site. For each serial port, match the baud rate, data bits, parity and stop bits to the device exactly, or it will not answer.
Does the ZJTS802 support redundant network or power for critical links?
No redundancy features are listed: it has a single 10/100M Ethernet port and no ring or dual-uplink function. For a critical link, connect it to an industrial ring switch so the network path is redundant, and feed it from a UPS-backed 12 V or 24 V DC supply on the 5–24VDC input. If you need more ports in one cabinet, the ZJTS804D is the DIN-rail model in the same family.
What power connector does the ZJTS802 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 ZJTS802 Series for your order.
Ordering questions — samples, shipping, payment, lead time and genuine stock — are answered once on our FAQ page.
Our own line — Zhongxin Shutong industrial switches1,500 m² clean rooms100% port-by-port tested-40…+75 °C rated, cycled to +85 °CEN 61000-4 Level 3 EMC immunitySerial-number traceability on every unitISO 9001 · 14001 · 27001 · CMMI L3See the factory →See all certifications →
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