IBM Modbus Plus manual Configuration Parameters, Card Segment

Modbus Plus X-Link Driver User’s Guide

3.1 Configuration Parameters

The Modbus Plus driver is distributed in the file SA85.DRV. Once the SA85.DRV is loaded into the X-Link, the following parameters are required:

Card Segment	The memory address for the SA85 card. The card requires 2K
	of memory in the range of C000 to EF80. Default is D000,
	second choice is D800.
Convert Floats	With this option is on, the Modbus Plus Driver will convert the
	data types between the integer supported by the Modbus Plus,
	and floating points stored in the X-Link. Incoming integers will
	be expanded to floats; the floats written to the Modbus Plus will
	be truncated. When this option is off, the floating points will be
	read and written as two consecutive integers. Default option is
	Off.
Poll Rate	Because the driver does not use interrupt settings, it must
	access data from the card at a certain rate. The poll rate ranges
	from 2 ms to 255 ms with a default of 10 ms.

The memory address selected must match the switch settings on the SA85. The memory base address switches are located near the bus connector on the SA85 and are not accessible from the outside of the X-Link.

The Modbus Plus node address must also be set on the SA85. The switches to set the station address are accessible from the end of the X-Link.

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