KD485-PROG 232/232 DINrail Programmable RS232 Isolator

Overview of the KD485

The KD485 is a multi-purpose isolated RS232/422/485/20mA interface converter with intelligent data processing options.

Three standard product versions cover most industrial interface and protocol conversion applications.

Another common requirement is multi-drop connection of non-addressable RS232/422/20mA devices, to enable them to be conveniently polled from a single RS422/485 Master device. The KD485-ADE can act as an "addressable adapter" for each RS232 device.

Many projects involve the interconnection of equipment which is mutually incompatible. The KD485-PROG can be programmed - in ANSI C - to convert virtually any industrial automation protocol into any other. A MODBUS RTU comms library is available for rapid MODBUS RTU SLAVE protocol converter development, enabling a non-MODBUS device to appear as a MODBUS RTU SLAVE device.

Standard Versions

The KD485 is available in three stock versions which share the following common features:

• DIN-rail enclosure with removable screw terminals; fits 35mm symmetric rails
• 29mm width on DIN rail
• DC power input in the range +7V to +35V; uses a high efficiency switching power supply
• Two serial ports: port 1 and port 2; isolated from each other and from the power supply
• Port 1 is RS232; port 2 is RS422/485 as standard
• Either port can be factory-fitted as RS232, RS422/485 or 20mA Loop
• Controlled slew rate drivers on RS422/485 ports - no terminators needed for cables shorter than 300m
• Internal pull-up and pull-down resistors on RS422/485 ports ensure that RS485 bus floats to a valid state when not driven.

KD485-PROG

This fully programmable version has all the KD485-ADE features, plus a large EEPROM and a means of uploading user-written programs in to it. Programs can be written in ANSI C, assembler and other languages, and are uploaded to the KD485-PROG with supplied software (DOS or Windows). This programmable adapter requires the appropriate Borland C compiler () in order to program its operation.

• A MODBUS RTU library is available which greatly speeds up the development of MODBUS-to-custom protocol converters.
• Download an Acrobat format KD485 MODBUS Library User Manual (133kb)