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1785-KE

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Allen-Bradley 1785-KE is a 1771-rack interface that connects a programmable RS-232-C device to an Allen-Bradley Data Highway Plus network.
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Technical specifications for 1785-KE

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-KE
  • Product Family:
    PLC-5
  • Product Type:
    Data Highway Plus Interface Module
  • Stock:
    1
  • DH+ Rate:
    57,600 bps
  • DH+ Port:
    3-screw terminal block
  • Terminal Port:
    9-pin male EIA D-shell
  • RS-232-C Port:
    15-pin female EIA D-shell
  • Power Requirement:
    1.2 A at 5 V DC
  • Operating Temperature:
    0 to 60 °C
  • Storage Temperature:
    -40 to 85 °C
  • Humidity:
    Up to 95% noncondensing
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Serial Device Role DH+ Interface Rack & Cabling Product Applications

Features:

  • RS-232-C device access to Data Highway Plus
  • 1771 I/O rack installation with 5 V backplane power
  • Separate DH+, terminal, and asynchronous serial connections
Allen-Bradley 1785-KE acts as the boundary between a programmable serial device and a legacy Data Highway Plus network.

Its three connector roles keep the DH+ dropline, 1784-T50 terminal access, and asynchronous RS-232-C device interface distinct during wiring and troubleshooting.

A dependable installation depends on the correct terminal-or-modem cable, Belden 9463 DH+ cabling, available rack current, and matched serial communication settings.

Apter Power can review 1785-KE Series, rack, serial-device role, and cable requirements before quotation.
1785-KE Manuals, Datasheets, Links Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Connect one programmable RS-232-C-compatible device
  • Use the 15-pin female asynchronous port
  • Match terminal or modem wiring to the connected equipment
  • Attach the network through the 3-screw DH+ terminal
  • Operate Data Highway Plus at the documented 57,600 bps
  • Use Belden 9463 for the user-supplied dropline
  • Install the module in a 1771 I/O rack
  • Reserve 1.2 A from the 5 V DC backplane
  • Use 1770-CG or equivalent for data-terminal wiring
  • Use 1770-CP or equivalent for modem wiring
  • Connect legacy programmable serial devices to Data Highway Plus
  • Integrate computer or terminal equipment with installed PLC networks
  • Support maintenance access within documented 1771 communication architectures
Description
An asynchronous device can enter a Data Highway Plus system through the Allen-Bradley 1785-KE, a communication interface designed for installation in a 1771 I/O rack.

The Allen-Bradley 1785-KE presents separate connections for Data Highway Plus, a 1784-T50 terminal, and an asynchronous RS-232-C device. This port arrangement lets legacy computers or other programmable serial equipment exchange data across the installed DH+ network.

Cable selection is central to a usable Allen-Bradley 1785-KE installation: Rockwell identifies 1770-CG or equivalent for a data-terminal interface, 1770-CP or equivalent for modem use, and Belden 9463 for the DH+ dropline. Rack power and ambient limits also remain part of the commissioning check.
Revisions

Revision Part #

Also known as

1785-KE Ser A
1785-KE/A, Series A, Rev A
1785-KE Ser B
1785-KE/B, Series B, Rev B
Alternative Names
Allen-Bradley 1785-KE module 1785 KE 1785KE PLC-5 DH+ RS-232 interface AB Data Highway Plus interface
Technical notes
Allen-Bradley 1785-KE must be wired for the correct serial-device role: use the documented data-terminal or modem cable at the 15-pin RS-232-C port and a Belden 9463 dropline on Data Highway Plus. Confirm 1771-rack power capacity, DH+ addressing, serial settings, and port pinout before diagnosing protocol traffic.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What device role is 1785-KE intended to bridge?
It interfaces a programmable RS-232-C-compatible device with an Allen-Bradley Data Highway Plus network from a 1771 rack.
Which cable choice changes the 1785-KE serial connection?
Use a data-terminal interface cable such as 1770-CG for terminal-style equipment or a modem interface cable such as 1770-CP for modem wiring.
How should 1785-KE be diagnosed when DH+ traffic is absent?
Check rack power, DH+ dropline polarity and termination, station addressing, serial wiring, and the connected device communication settings in that order.
Can 1785-KE communicate without a 1771 I/O rack?
No. Rockwell specifies the module location as a 1771 I/O rack, which supplies its backplane power and system placement.
What environmental limits should 1785-KE installation planning respect?
Plan for the documented 0 to 60 °C operating range and up to 95% noncondensing humidity, with suitable enclosure protection.
What information should accompany a 1785-KE quotation request?
Provide the module Series, rack and processor details, connected RS-232 device, cable type, DH+ address, and the required acceptance test.