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The PCL-818L provides one D/A output channel with two double-
buffered 12-bit multiplying D/A converters. Write registers at address-
es BASE+4 and BASE+5 hold data to be output. DA0 is the least
significant bit (LSB) and DA11 is the most significant bit (MSB) of
the D/A data. The register data format appears below:
Bit
Value
Bit
Value
When you write data to the D/A channels, write the low byte first. The
low byte is temporarily held by a register in the D/A and not released
to the output. After you write the high byte, the low byte and high byte
are added and passed to the D/A converter. This double buffering
process protects D/A data integrity through a single step update.
The PCL-818L provides a precision fixed internal -5 V or -10 V
reference, selectable by means of Jumper JP5. This reference voltage
is available at connector CN3 pin 11. If you use this voltage as the
D/A reference input, the D/A output range is either 0 to +5 V or 0 to
+10 V. You can also use an external DC or AC source as the D/A
reference input. In this case, the maximum reference input voltage is
±10 V, and the maximum D/A output ranges are 0 to +10 V or
0 to -10 V.
Connector CN3 supports all D/A signal connections. See Chapter 2,
Connector pin assignments, for connector pin assignments. Chapter 3
gives a wiring diagram for D/A signal connections.
44
PCL-818L User's Manual
D7
D6
D5
DA3
DA2
DA1
D7
D6
D5
DA11
DA10
DA9
D4
D3
D2
DA0
X
X
D4
D3
D2
DA8
DA7
DA6
D1
D0
X
X
D1
D0
DA5
DA4
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