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What is the pinout for a Modbus Plus programming cable?

It is actually a Modbus Plus network cable. The cable must be fabricated by the User. The Modbus Plus network cable can be built using the following parts:

Note that you cannot communicate Modbus Plus using a serial com port. You may use TSXCUSBMBP Modbusplus USB adaptor or you need a SA-85 Modbus Plus Communication Adapter.
These adapters come in several forms, ISA, PCI and PCMCIA. It is recommended that you read the Modbus Plus Network Planning and Installation Guide 890USEIOOOO