Allen Bradley 1747-KE  SLC 500  Interface Module

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Brand Name                 AB

Product reference     1747-KE

This chapter provides: • an overview of the interface module. • features (communication ports, LED indicators, and jumpers). • guidelines outlining the type of modems you can use with the module. • a brief discussion on using RSLinx software with your module. • typical configurations. Interface Module Overview The DH-485/RS-232C Interface Module, catalog number 1747-KE, is a communications interface module that acts as a bridge between DH-485 networks and devices requiring DF1 protocol. The DF1 port on the interface module can be configured for RS-232/423, RS-422, or RS-485 devices. Residing in an SLC 500 chassis, the module is ideally used as an interface module, linking remote DH-485 networks via a modem to a central host. 

Interface Module Overview

There are three communication ports on the front of the module. They are: • CONFIG - used to configure the module with an ASCII terminal. This serial port accommodates RS-232/423, RS-422, and RS-485 communication interfaces. The CONFIG port is capable of operating at 300, 600, 1200, 2400, 4800, 9600, and 19200 Kbps. It is electrically isolated to 500V dc. • DF1 - used to interface the module to a modem or other user devices using DF1 protocol. This serial port accommodates RS-232/423, RS-422, and RS-485 communication interfaces. The DF1 port is capable of operating at 300, 600, 1200, 2400, 4800, 9600, and 19200 Kbps. It is electrically isolated to 500V dc. • DH485 - used to interface the module with the DH-485 network. This port is not isolated and cannot directly drive a multi-node DH-485 network. You must use a 1747-AIC link coupler to connect this port to a DH-485 network that includes multiple SLC 500 processors. The 1747-C11 or 1747-C13 cables can connect the interface module’s DH-485 port to a 1747-AIC link coupler. The 1747-C13 cable can also connect the module’s DH-485 port directly to a single SLC processor. See page 4-11 for cable connections

Jumper JW1 JW1 lets you to select the communication interface for the CONFIG port. Refer to page 4-5. Jumper JW2 JW2 lets you to select the communication interface for the DF1 port. Refer to page 4-6. Jumper JW4 JW4 lets you to select the functionality and mode of the interface module. The orientation of the jumper determines the module’s functionality. A horizontal orientation gives the module functionality equivalent to a series A module (module configuration ID=4209), while a vertical orientation of the jumper accesses the added functionality of a series B module (module configuration ID=3509). The position of the jumper determines the module’s mode (Configuration or Run), and thus, which method is used to configure the module (ASCII terminal or backplane communications). 

The type of modems you can use are: • Manual - typically acoustically-coupled modems. A person on each end of the phone line establishes the connection. They then insert the handsets into an acoustic coupler to complete the connection. • DTE controlled answer - these unattended modems are attached directly to the phone lines. The interface module acts as the Data Terminal Equipment (DTE), which controls the modem via the DTR, DSR, and DCD signals. The module incorporates timeouts and tests to properly operate these types of modems. • Auto answer - these modems have self-contained timeouts and tests. They can answer and hang up the phone automatically. The module has no means of controlling an auto-dial modem, but it can be used in conjunction with a separate auto-dialer. • Direct connect - these modems connect to a dedicated, leased phone line and remain active at all times.

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