Publication 1747-RM001G-EN-P - November 2008
13-2 SLC Communication Channels
Communication Driver
Overview
DH-485 - The SLC 500 Fixed, SLC 5/01, SLC 5/02 and SLC 5/03 have a
dedicated channel for DH-485. SLC 5/03, SLC 5/04 and SLC 5/05 RS-232
channel 0 can be reconfigured for DH-485. This network is a multi-master,
token-passing network protocol capable of supporting up to 32 devices
(nodes). This protocol allows:
• monitoring of data and processor status, along with program uploading
and downloading of any device on the network from one location.
• SLC processors to pass data to each other (peer-to-peer
communication).
• operator interface devices on the network to access data from any SLC
processor on the network.
Data Highway Plus (DH+) - The Data Highway Plus protocol is used by
the SLC 5/04 processor. This protocol is similar to DH-485, except that it can
support up to 64 devices (nodes) and runs at faster communication (baud)
rates.
Ethernet - The Ethernet TCP/IP protocol is used by the SLC 5/05
processor. Standard Ethernet, utilizing the TCP/IP protocol, is used as the
backbone network in many office and industrial buildings. Ethernet is a local
area network that provides communication between various devices at 10
Mbps or higher. This network provides the same capabilities as DH+ or
DH-485 networks, plus:
• SNMP support for Ethernet network management.
• optional dynamic configuration of the processor IP address using
BOOTP or DHCP.
• ability to message entire SLC 5/05 data files.
• an unlimited number of nodes on a single network are possible
compared to DH-485 (32) and DH+ (64).
• 64 maximum message connections opened at one time (for 64 K
processors); 4 incoming, 4 outgoing and 56 either incoming or outgoing.
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