- General Info
- Specifications
- Pinouts
- Images
- Troubleshooting
- Applications
DESCRIPTION
The ETH-SER-EE9 is a rugged industrial-grade power efficient (less than 1.4 Watts) serial device server which will convert from RS232, RS485 or RS422 serial to Ethernet or vice versa. The ETH-SER-EE9 serial device server will also make serial devices internet ready supporting TCP, UDP, ARP, ICMP, DHCP and Windows Native COM, LLF protocols. The ETH-SER-EE9 provides one serial port (RS232: DB9, RS485/RS422: 5 position terminal block) and one 10/100M Ethernet port in order to convert from serial devices to IP-based Ethernet and vice versa.
The ETH-SER-EE9 can be configured with a VSP Management Software and an online browser-based configuration tool or through AT commands. The software user interface is robust in functionality enabling the experienced Engineer to do complex configuration tasks while simple enough for a novice to use. All configurations can be performed by the Ethernet network (supporting communication across gateways and routers) or by the serial port, making the ETH-SER-EE9 convenient and user-friendly.
The ETH-SER-EE9 is designed with ESD protection as well as voltage surge protection and is specifically designed to function reliably in hazardous environments. It can be used as a stand-alone unit, wall or panel mounted or DIN rail mounted with optional DIN rail mounts. The unit is enclosed in a heavy duty steel housing for rugged applications. This converter operates 10/100M Ethernet and from 0 to 115,200 baud serial.
Industrial Ethernet to Serial Converter / Server
30-day Money Back Guarantee / 5-year Replacement Warranty

SerialComm Model: ETH-SER-EE9
FEATURES
- High Performance 32 Bit ARM Procoessor
- 3-in-1 RS232/RS485/RS422 Serial Interface
- 300 baud to 115.2K baud Serial Transmission
- TCP, UDP, ARP, ICMP, HTTP & DHCP Protocols
- Standard TCP/IP Socket
- Static or Dynamic IP
- Network or Serial Interface Configuration
- Windows Serial Interface Driver Mode
- Low Consumption Design: Less than 1/4 Watt
- Industrial-grade Temperature
- Interchangable Serial Protocol Compatibility
- Built-in surge and static protection
- 5 year manufacturer's warranty
- CE, FCC, RoHS 3, and REACH certified
DATASHEETS
2D CAD DRAWINGS AND 3D MODELS
ST Type
PRODUCT COMPLIANCES
ISO-9001:2015 QUALITY MANAGEMENT

Our internationally recognized ISO-9001:2015 Quality Management System (Cert. No. 743003912) with a scope of “Design, Sales and Distribution of Data Communication Products and IT Support Services” was recognized and certified by TÜV Rheinland of North America known for its very demanding and stringent requirements. For more details see our Quality Policy.
GENERAL | |
MODEL NUMBER: | SER-ETH-EE9 |
STANDARDS: | IEEE-802.1 10Base-T(X), IEEE 802.3u, 100Base-T(X), EIA/TIA RS232, 2 wire RS485 and 4 wire RS422 |
ETHERNET PROPERTIES | |
SUPPORTED PROTOCOLS: | TCP, UDP, APR, ICMP AND DHCP Protocols |
WORKING MODE: | Server and Client Modes |
ETHERNET DATA SPEED: | 10 / 100 Mpbs |
ETHERNET TRANS. TYPE: | Full-duplex and Half-duplex |
ETHERNET CONN. TYPE: | RJ45 |
ETHERNET TRANS. DIST.: | Up to 330 ft (100 m) |
ETHERNET CABLING: | CAT 3, 4, 5 |
ETHERNET SIGNALING: | TX+, TX-, RX+, RX- (MDI or MDI-X) |
SERIAL PROPERTIES | |
SERIAL INTERFACES: | Heavy Duty Steel Case |
SERIAL DATA SPEEDS: | 300 baud to 115,200 baud |
SERIAL TRANS. TYPE: | RS485: Half-duplex, RS232/RS422: Full-duplex |
SERIAL CONN. TYPE: | RS232: DB9 Male, RS485/RS422: 5 Position Terminal Block |
SERIAL TRANS DIST.: | RS232: 50 ft (15 m), RS485/RS422: 4000 ft (1200 m) |
RS232 SIGNALING: | TX, RX, RTS, CTS, DTR, DSR, GND |
RS485 SIGNALING: | D+ (A), D- (B), GND |
RS422 SIGNALING: | TX+, TX-, RX+, RX- GND |
DATA BIT OPTIONS: | 5 Bit, 6 Bit, 7 Bit, 8 Bit |
PARITY OPTIONS: | None, Even, Odd, Space, Mark |
FLOW CONTROL: | None, RTS/CTS (Hardware) or XON/XOFF (Software) |
MAX # OF CONNECTIONS: | RS485/RS422: 32 Connection Nodes |
DIRECTION CONTROL: | Auto Sensing / Auto Turnaround |
ELECTRICAL | |
POWER SOURCE: | 9 to 48 VDC |
DC/AC POWER ADAPTER: | Included 12VDC / (100-240VAC 50/60hz US Type A Plug) Adapter |
POWER CONSUMPTION: | Approxiamately 1/4 Watt |
LAN STATIC PROTECT.: | 1.5KV Electric Static Discharge (ESD) Protection |
SER. STATIC PROTECT.: | 15KV ESD Protection |
SURGE PROTECTION: | 600W Surge Protection |
MECHANICAL | |
HOUSING: | Heavy Duty Steel Case |
DIN RAIL: | Optional DIN Rail Mounts |
WEIGHT: | 18.70 oz (530.0 grams) |
DIMENSIONS: | 3.94 X 2.70 X 0.87 in (100 X 69 X 22 mm) |
ENVIRONMENTAL | |
OPERATING TEMP.: | -40ºF to 185ºF (-40ºC to 85ºC) |
STORAGE TEMP.: | -40ºF to 185ºF (-40ºC to 85ºC) |
OPERATING HUMIDITY: | 5% To 95% - No Condensation |
QUALITY | |
PRODUCT SAFETY: | CE, FCC, RoHS 3, and REACH certified |
QUALITY MANAGEMENT: | Manufactered and Distributed to ISO-9001:2015 |
RELIABILITY: | Low Failure Rate - 99+% Reliability Since Inception |
WARRANTY: | 5-year Replacement Warranty |
ETHERNET RJ45 FEMALE
PIN | MDI SIGNAL | MDI X SIGNNAL | |
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1 | TX+ | RX+ |
2 | TX- | RX- | |
3 | RX+ | TX+ | |
6 | RX- | TX- | |
4, 5, 7, 8 | --- | --- |
RS232 DB9 MALE
FUNCTION | NC | RxD | TxD | DTR | GND | DSR | RTS | CTS | NC |
PINOUT | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |

FLEXIBLE SERIAL CONVERSION
PINOUT | 1 | 2 | 3 | 4 | 5 |
RS422 | TX+ | TX- | GND | RX+ | RX- |
RS485 | D+ | D-- | GND |
POWER 3 POSITION TERMINAL BLOCK
PINOUT | 1 | 2 | 3 |
POWER | V+ | FG | V- |
ETH-SER-EE9 Dimensions









Step-by-Step troubleshooting procedures are detailed in the ETH-SER-EE9 User Manual
Download FREE FULL VERSION AccessPort Advanced Serial Monitor, Simulation and Data Analysis Software Tool. This software tool is great for testing converters. Supports Windows 98/XP/VISTA/WIN 7/8/10/11. DOWNLOAD SOFTWARE AND USER MANUAL