Publication 1785-UM012D-EN-P - July 2005
9-2 Communicating with Devices on a DH+Link

Devices that You Can Connect
Link Design

Specify 1770-CD (Belden 9463) cable. Connect a DH+ network using a daisy

chain or trunk line/drop line configuration.

Verify that your system’s design plans specify cable lengths within allowable

measurements.

For daisy chain configurations, use this table to determine the total cable

length you can use.

Product Catalog
Number Application Required
Cables
ControlLogix Data Highway Plus Remote I/O
Interface Module 1756-DHRIO Allows communication between PLC-5 controllers over
different networks, such as Data Highway Plus,
ControlNet and Ethernet
1770-CD
Data Highway or Data Highway Plus
(RS-232C or RS-422-A) Interface Module 1770-KF2 Connects an asynchronous (RS-232C) device to a Data
Highway or DH+ network 1770-CD
Data Highway / Data Highway Plus
on Broadband 1771-KRF Media bridge connecting as many as 18 Data Highway
networks to communicate over a facility-wide broadband
cable system
Communication Interface Card 1784-KL Connects the T47 Portable Programming Terminal to DH+ 1784-CP
1784-CP2
1784-CP3
1784-CP5
1784-CP6
Data Highway Plus XT/AT Interface Module 1784-KT Connects IBM XT or AT compatible computers to DH+
Data Highway Plus PS/2 Interface Module 1784-KT2 Connects IBM PS/2 compatible computers to DH+
Data Highway Plus to Data Highway
Interface Module 1785-KA Connects a Data Highway network to a DH+ network 1770-CD
DH+ to DH-485 Interface Module 1785-KA5 Connects a DH-485 link to a DH+ link.
Data Highway Plus RS-232C Interface
Module 1785-KE Connects an asynchronous (RS-232C) device and DH+
PCMCIA Card 1785-PCMK Connects PCMCIA Bus notebook computers to DH+ 1784-PCM5
IMPORTANT The maximum cable length for DH+ depends on the

transmission rate. Configure all devices on a DH+ link to

communicate at the same transmission rate.

Trunk line/drop line considerations:
When using a trunk line/drop line configuration,
use 1770-SC station connectors and follow these
cable-length guidelines:
• trunk line-cable length – depends on the
communication rate of the link
• drop-cable length – 30.4 m (100 cable-ft)
For more information about designing trunk
line/drop line configurations, see the Data
Highway Plus/Data Highway II/Data Highway-485
Cable Installation Manual, publication 1770-6.2.2.
A DH+ link using this
communication rate Cannot exceed this
cable length
57.6 kbps 3,048 m (10,000 ft)
115.2 kbps 1,524 m (5,000 ft)
230.4 kbps 762 m (2,500 ft)