Robust DataComm rdc485ih-dv-4p-cc Hub/Converter Guide De Spécification

Model: rdc485ih 

Isolated Intelligent Hub, RS-232 to Dual RS-485  

The rdc485ih allows connection of one RS-232 and two RS485 
devices complete with full 4-port 2.5kv optical/galvanic isolation - 
including 3 isolated DC supplies.  Each port is fully isolated (with 
floating ground) with reference to the other data ports and the 
power supply.  

In a Master/Slave configuration (Mode 1), any data received on 
port C ("Master") is echoed out from both ports A and B 
("Slaves").  In a hub configuration (Mode 2), any port can freely 
talk to the other two.  Any data received on any port is echoed 
out the other two.  Data received on either port A or B is only 
echoed to port C ("Master").  In Switch mode, only port B is 
allowed to talk to port C. When the external terminal (SWITCH) is 
pulled to ground, only port A is allowed to talk to port C. 

The RS-485 ports can be field set for 2 or 4-wire (default) 
operation and includes options for line biasing and a 120-ohm 
internal termination.  500-watt voltage transient suppressor 
diodes protect the rdc485ih from normal mode surges, while full 
galvanic isolation protects the unit from common mode surges.  

Isolation, industrial design, small size, DIN rail mount, user 
indication, and DC supply make the rdc485ih a very engineer-
friendly device for your industrial data communication system. 

RS-232/485 port Description:  

Port Type ............................... EIA/RS-232 EIA/RS-485  
Voltage Levels ....................... ±9v DC -7 to +12v DC  
Permitted Surge ..................... ±25v DC ±25v DC  
Surge Diodes Installed .......... ±15v, 500-watt ±15v, 500-watt  

Isolation (ISO/IEC 9549):  

RS-232 to RS-485 to RS-485 ...... 2500v (optical, 5kV test)  
Power to RS-485 Port A ........ 2500v (galvanic, 3kV test)  
Power to RS-485 Port B ........ 2500v (galvanic, 3kV test)  
Power to RS-232 Port C ........ 2500v (galvanic, 3kV test)  
Conformal Coating ................. (optional) 5000v spec  

Power Supply Options:  

9v to 36v DC (1.5watt max).... 12v or 24v including batteries  
48v DC +/- 20% (38-58v)........ 48v for telecom & transportation  
5v DC +/- 5% (4.75-5.25v)...... 5v for OEM integration  
User Indication ....................... Green LED for power status  

Communication:  

Max Speed ............................  115kbps , no config required  
Character Setting ................... Transparent, no config required  
Duplex / Direction ..................  Automatic, no RTS/CTS required  
User Indication ....................... Yellow LED for each Receive  
 

 

 

Signal Red “Break’ LED for each 

   RS-485 

 

Maximum Bus Length ............ 1000m per EIA-48515m per EIA-
   232 

Environmental:  

Ambient operating temperature:  -20C to + 65C  
Ambient storage temperature:  -40C to +100C  
Relative Humidity....................10 to 95% RH, non condensing  
Casing; good fungus & termite resistance; self-extinguishing.  
Weight ................................... 130g.  
Terminal Capacity .................. 2.5mm strand (12 AWG)  
   4.0mm 

solid 

(12 

AWG). 

 

Mounting Rail ......................... DIN EN 50022 (35mm  
   symmetrical) 

 

DIN EN 50025 (32mm asymmetrical)  
(Note: Style DIN 50022 works best) 
 

Copyright 2007 © Robust DataComm Pte Ltd 

(Version 1.0) Specifications subject to change without notice

 

 
 
 
 
 
 
 
 

Master/Slave (Default) mode : One RS-232 Host has 2 RS-485 
network (can be multi-dropped)

 
 
 
 
 

Hub mode : Two RS-485 Hosts share single RS-232 Slave (only 
ONE host can talk to slave at one time – rdc485ih does NOT 
arbitrate) 
Switch mode : If there is a risk of 2 hosts talking simultaneously, 
Switch mode can be used to only allow one of them to talk to the 
slave. 

  

  

  

  

  

Input Power Supply (Select One)  

  

9 to 36vDC, 1.5 watt (63mA@24v)  

  

48vDC +/- 20% 1.5 watt  

  

5vDC +/- 5% (260mA max)  

  

  

Ground Isolation (No Option)  

  

  

Full 4-of-4 Ground Isolation  

  

  

  

Connectors (Select One)  

  

  

  

RS-232 = DB9, RS-485 Terminals 

  

  

  

All 9-pin D-Shell  

  

  

  

  

Other Options (none required)  

  

  

  

  

fc   Conformal Coating (+5000v)  

Example: model rdc485ih-dv-4p-cd is an “Isolated Intelligent Hub, 
1 x RS-232, 2 x RS-485 Ports, DIN-Rail Mount, 9-36vDC Supply, 
Full 4-of-4 Ground Isolation, 9-pin D-Shell for RS232 port, 
removable screw terminals for RS485 ports.” 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

Logic 

Unit