Robust DataComm rdc485Enet Isolated Device Server Specification Guide

Making Industrial Data Flow Like Water ... Safely, Silently, & Sanely

Robust DataComm Pte Ltd (USA) 26471 Portola Pkwy #1E-242, Foothill Ranch CA 92610-1743, +1,972248--7466

(International) 18 Kaki Bukit Road 3 #02-08 Entrepreneur Business Centre Singapore 415978, +65,6487-5624

The rdc485Enet safely and easily connects an 
industrial device with serial interface (RS-485, 2 
or 4-wire) to an Ethernet network while 
providing the ultimate in isolation, surge, and 
noise protection.  The RS-485 port and network 
port are isolated from each other as well as the 
DC supply ground. 600w transient suppressor 
diodes further protect the RS-485 port from 
momentary surges. Standard industrial 
automation protocols like Modbus/TCP is also 
supported.

Isolation, industrial design, small size, DIN rail 
mount, user indication, and wide range DC 
supply make the rdc485Enet a very engineer- 
friendly device for your industrial data 
communication system.

Model: rdc485Enet

Specification

Mechanical / Environment

Power Supply

Isolation

(version 1.0)

Copyright © 2004 RDC

Serial Interface

Network Interface

Standards : TCP/IP, UDP/IP, DHCP, SNMP, SSL/TLS

  HTTP, SMTP, ICMP, IGMP and ARP

Interface : 10/100Base-T Ethernet

Connector : RJ45

Interface : EIA/RS-485A

Connector : 5-pin compression terminal block 

Data Rate : Up to 230,400 bps (configurable)

User Indications : Network Link and Activity indication

User Indications : Txd and Rxd Indication

RS-485 to Ethernet
Supply to Ethernet

Supply to RS-485

: complete galvanic isolation 2.5Kv
: complete galvanic isolation 2.5Kv

9~36 vDC

5vDC +/-5%

User Indication

: 2.5w normal operation
: 400mA normal operation
: Green LEDs for power indication

Characters : Configurable (5,6,7,8 databits)

Parity : Configurable (odd,even,none,mark,space)

Stop Bits : Configurable ( 1,2 bits)

Operating Range

Storage Range

Relative Humidity

Terminals

: -20C to +65C
: -40c to +100C
: 10 to 90% RH, non-condensing
: 5-pin, wire up to 2.5mm (12AWG)

Case Material

Weight

Mounting Rail

: nylon polymide, fungus and termite resistant
  self-extinguishing
: approx 130g
: DIN EN 50 022 or DIN EN 50 035

4

3

2

Block Diagram

Isolated

Supply

LED

T-

R-

R+

5-pin Compression Terminal

V+
V--

LED

Main
Supply

LED

LED

D+

D-

SGnd

screw terminals

screw terminals

RJ45 Ethernet 

: complete galvanic isolation 2.5Kv

Isolated

Supply

Dev

ic

e

 S

e

rv

e

r

Order Information

-

-

5v

dv

2p

3p

3-port, RS485, Ethernet and
Supply fully isolated

2-port, Ethernet port grnd = supply grnd

rdc485Enet

Boxes in BOLD indicate factory default options

Dimensions in mm (and inches)

25 (1.0)

79 (3.1)

85.5 (

3

.4)

9

0

.5

 (

3

.6

)

93.0 (

3

.7)

EN 50 022 - 7.5mm
EN 50 035
EN 50 022 - 15mm

93 (3.7)

RS-
4

8

5

 to
 Eth

e

rn

et Co

nverter (Device Server)

1

5

T+

SGnd

-

-

nnn

Term Resistor Value
Custom value

120 Ohms

dr

cr

Connector Configuration
D-sub RS-485, RJ45 for Ethernet

C-term RS-485, RJ45 Ethernet

T+

T-

R+
R-
SG

hv

9v to 36v Unregulated DC Supply (12v & 24v)

38v to 58v Unregulated DC Supply (±48v)

5v ±5% Regulated DC Supply