Installation 
10  UDC2500 Universal Digital Controller Product Manual  4/07 
Specifications 
RS422/485 Modbus 
RTU 
Communications 
Interface (Optional) 
Baud Rate: 4800, 9600,19,200 or 38,400 baud selectable 
Data Format: Floating point or integer 
Length of Link: 
   2000 ft (600 m) max. with Belden 9271 Twinax Cable and 120 ohm termination resistors 
   4000 ft. (1200 m) max. with Belden 8227 Twinax Cable and 100 ohm termination resistors
Link Characteristics: Two-wire, multi-drop Modbus RTU protocol, 15 drops maximum or up 
to 31 drops for shorter link length. 
Ethernet TCP/IP 
Communications 
Interface (Optional) 
Type: 10Base-T 
Length of Link: 330 ft. (100 m) maximum. Use Shielded twisted-pair, Category 5 (STP 
CAT5) Ethernet cable. 
Link Characteristics: Four-wire plus shield, single drop, five hops maximum 
IP Address: IP Address is 10.0.0.2 as shipped from the Factory 
Recommended network configuration: Use Switch rather than Hub in order to maximize 
UDC Ethernet performance. 
Configuration: Ethernet parameters are configured via the Process Instrument Explorer. 
Email: The capability to send an Email is provided. This must be configured via the Process 
Instrument Explorer. 
Infrared 
Communications 
(Optional) 
Type: Serial Infrared (SIR) 
Length of Link: 3 ft. (1 m) maximum for IrDA 1.0 compliant devices 
Baud Rate: 19,200 or 38,400 baud selectable 
Power Consumption 
20 VA maximum (90 to 264 Vac) 
15 VA maximum (24 Vac/dc) 
Power Inrush Current 
10A maximum for 4 ms (under operating conditions), reducing to a maximum of 225 mA (90 
to 264 Vac operation) or 750 mA (24 Vac/dc operation) after one second. 
 
CAUTION
 
  When applying power to more than one instrument, make sure that sufficient 
power is supplied. Otherwise, the instruments may not start up normally due to voltage drop 
from the inrush current. 
Weight 
3 lbs. (1.3 kg)