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3.5 RS485 Port
3.5.1 Overview
It is possible to connect up to 32 x ISPnano programmers (Series I, II or III) to a single PC COM port
using the ‘RS485 Network’ . The programmers are daisy-chained together on an RS485 network
using special ‘5-pin Molex RS485 Cables’ which connect to the ‘RS485 In / Out’ connectors on the
ISPnano programmer.
The diagram below shows a typical RS485 programmer network with 2 x ISPnano programmers
daisy-chained together.
The RS485 converter should be placed as close to the PC as possible so as to minimise the length of
the RS232 cable. The cable from the RS485 Converter to the first ISPnano programmer must be
terminated using the ‘RS485 FCC68 to 5-pin Molex Converter Module’ as the ISPnano uses a
smaller 5-pin Molex connector.
3.5.2 Equipment required
To operate the programmers in multi-channel RS485 mode, you will need the following equipment:
ISPnano Series Programmer - User Manual – V1.11 – 12 May 2011
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1 x PC with spare 9-way COM Port
1 x Equinox ‘RS232 to RS485 Converter’ (Order code: RS485-C2)
1 x ‘RS485 FCC68 to 5-pin Molex Converter Module’ (Converts RJ11 to 5-pin Molex
ISPnano RS485 connector)
1 x RJ11 RS485 Flat Cable (pin-out crossed)
n x ‘5-pin Molex RS485 Cable’ (for connecting between ISPnano programmers – where n is
the number of programmers)
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