Application and Installation Guide EMCP 4 SCADA Data Links
©2013 Caterpillar
All rights reserved. Page 2
T
ABLE 1-2: COMPARING RS-485 VS TCP/IP SCADA DATA LINKS
Property RS-485 SCADA TCP/IP SCADA
Distance 4000 ft 330 ft
Speed 10-56kbps 10Mbps
Topology bus only bus, star, etc
Termination required at ends not required
Communication model master-slave peer-peer
Cabling 1-pair plus reference,
shielded
2-pair twisted
Mean response time 120 ms 30 ms
Configuration ease simple complicated
NOTE: EMCP Monitoring Software is specifically designed PC software that offers
customers a method to monitor and control Caterpillar electric power devices by
means of a RS-485 Modbus RTU and TCP data links. EMCP Monitoring Software
and documentation can be downloaded from Cat PowerNet, under Products > EMCP
Controls > EMCP 4.
1.3 REFERENCES
Modbus Application Protocol Specification
Available from www.modbus.org
Modbus over Serial Line Specification and Implementation Guide
Available from www.modbus.org
Modbus Messaging on TCP/IP Implementation Guide
Available from www.modbus.org
EMCP 4.1 and 4.2 Application and Installation Guide
LEBE0006, available from Cat PowerNet, under Products > EMCP Controls > EMCP 4
EMCP 4.3 and 4.4 Application and Installation Guide
LEBE0007, available from Cat PowerNet, under Products > EMCP Controls > EMCP 4
EMCP Monitoring Software version 3.1 (P/N: 276-1861)
Available from Cat PowerNet, under Products > EMCP Controls > EMCP 4
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