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DMC-3425 Appendices• 179
64 Extended I/O of the DMC-3425 Controller
The DMC-3425 controller offers 64 extended I/O points, which can be interfaced to Grayhill and
OPTO-22 I/O mounting racks. These I/O points can be configured as inputs or outputs in 8 bit
increments through software. The I/O points are accessed through two 50-pin IDC connectors, each
with 32 I/O points.
Configuring the I/O of the DMC-3425 with DB-14064
The 64 extended I/O points of the DMC-3425 w/DB-14064 series controller can be configured in
blocks of 8. The extended I/O is denoted as blocks 2-9 or bits 17-80.
The command, CO, is used to configure the extended I/O as inputs or outputs. The CO command has
one field:
CO n
Where, n is a decimal value, which represents a binary number. Each bit of the binary number
represents one block of extended I/O. When set to 1, the corresponding block is configured as an
output.
Note: The CO command must be sent through the SA command to configure outputs for slave
controller extended I/O.
The least significant bit represents block 2 and the most significant bit represents block 9. The decimal
value can be calculated by the following formula. n = n
2
+ 2*n
3
+ 4*n
4
+ 8*n
5
+16* n
6
+32* n
7
+64*
n
8
+128* n
9
where n
x
represents the block. If the n
x
value is a one, then the block of 8 I/O points is to
be configured as an output. If the n
x
value is a zero, then the block of 8 I/O points will be configured
as an input. For example, if block 4 and 5 is to be configured as an output, CO 12 is issued.
8-Bit I/O Block Block Binary Representation Decimal Value for Block
17-24 2
2
0
1
25-32 3
2
1
2
33-40 4
2
2
4
41-48 5
2
3
8
49-56 6
2
4
16
57-64 7
2
5
32
65-72 8
2
6
64
73-80 9
2
7
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.