Optima Company PC Adding Hardware, Adding Boards, Installing the Modbus Plus SA85 Board

2.4 Adding Hardware

Observe proper ESD precautions (use an appropriately grounded wrist strap or similar device) when installing any device.

2.4.1 Adding Boards

The OPtima PC has 1 PCI expansion slot and two ISA slots. Access to these slots is through a cover (at the top of the DSA2; the side of the DSB2). Half-size ISA cards will fit the ISA slots. Full size ISA cards will not. Cards longer than 7- 1/4” (185mm) will not fit in the ISA slots. PCI cards must be the standard 4-3/4” (120mm) length. PCI Cards longer than this will not fit.

Card options that should function in the OPtima PC include PCI/ISA network (ethernet, etc.), modem, and serial cards. PCI serial cards that autodetect ad- dressing may work best. It is not recommended to use sound cards in the OPtima PC (the voltages required for sound cards are not presently available).

2.4.2Installing the Modbus Plus SA85 Board

1.Set the memory address to D0000 (switch 2 in the “up” position; all others in the “down” position). Place the jumper in the IRQ5 position. Set the Modbus Plus address switches to Address 61 (which is reserved for the OPtima PC). Other operator stations can be Address 62-64. Note that the address will be one higher than the binary value set on the switches, so that Address 61 is entered as “001111” (60). With the PC off, place the board in the ISA slot closest to the back. Screw down the board and replace the cover.

If a 2nd SA85 card is added, the IRQ and memory address must be different from the first card (set the memory address to D0800 or D4000 and check your system config for an unused IRQ). Units with 2nd cards shipped BEFORE March 2001 were setup as IRQ7, memory address D4000. AFTER March 2001, units with 2nd cards were setup as IRQ2, memory address 0800.

Jumper (shown in IRQ5 position)

				Memory Base
				Address Switches
	Memory	Switch Position (“down” = 0)
	Address	1	2	3	4	5	6	7
	D0000	0	1	0	0	0	0	0
	D0800	0	1	0	0	0	0	1
	D4000	0	1	0	1	0	0	0
	Switch 8 is not used.
				Modbus Plus
				Address Switches
	Node	Switch Position (“down” = 0)
	Address	1	2	3	4	5	6
	61	0	0	1	1	1	1
	62	1	0	1	1	1	1
	63	0	1	1	1	1	1
	64	1	1	1	1	1	1
	Switch 7 and 8 are not used.
Figure 5. SA85 Board Jumpers & Switches

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