Galil DMC-2X00 user manual Accessing Extended I/O

8-Bit I/O Block	Block	Binary	Decimal Value for
		Representation	Block
17-24	2	20	1
25-32	3	211	2
33-40	4	22	4
41-48	5	23	8
49-56	6	24	16
57-64	7	25	32
65-72	8	26	64
73-80	9	27	128

The simplest method for determining n:

Step 1. Determine which 8-bit I/O blocks to be configured as outputs.

Step 2. From the table, determine the decimal value for each I/O block to be set as an output. Step 3. Add up all of the values determined in step 2. This is the value to be used for n.

For example, if blocks 2 and 3 are to be outputs, then n is 3 and the command, CO3, should be issued. NOTE: This calculation is identical to the formula: n = n2 + 2*n3 + 4*n4 + 8*n5 +16* n6 +32* n7 +64* n8 +128* n9 where nx represents the block.

Saving the State of the Outputs in Non-Volatile Memory

The configuration of the extended I/O and the state of the outputs can be stored in the EEPROM with the BN command. If no value has been set, the default of CO 0 is used (all blocks are inputs).

Accessing Extended I/O

When configured as an output, each I/O point may be defined with the SBn and CBn commands (where n=1 through 8 and 17 through 80). Outputs may also be defined with the conditional command, OBn (where n=1 through 8 and 17 through 80).

The command, OP, may also be used to set output bits, specified as blocks of data. The OP command accepts 5 parameters. The first parameter sets the values of the main output port of the controller (Outputs 1-8, block 0). The additional parameters set the value of the extended I/O as outlined:

OP m,a,b,c,d

where m is the decimal representation of the bits 1-8 (values from 0 to 255) and a,b,c,d represent the extended I/O in consecutive groups of 16 bits (values from 0 to 65535). Arguments which are given for I/O points which are configured as inputs will be ignored. The following table describes the arguments used to set the state of outputs.

Argument	Blocks	Bits	Description
m	0	1-8	General Outputs
a	2,3	17-32	Extended I/O
b	4,5	33-48	Extended I/O
c	6,7	49-64	Extended I/O
d	8,9	65-80	Extended I/O

118 • Chapter 7 Application Programming DMC-2X00