Advantech PCM-3718H handleiding

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PCM-3718 Series User Manual 36
4.6 D/A Output — BASE+04/05H (PCM-3718HO only)
Write-only registers BASE+04H and BASE+05H accept data for D/A
output.
PCM-3718HO provides one D/A output channel with two double-buff-
ered 12-bit multiplying D/A converters. Write registers at addresses
BASE+04H and BASE+05H hold output data. DA0 is the least signifi-
cant bit (LSB) and DA11 is the most significant bit (MSB) of the D/A
data.
DA11 ~ DA0 Analog to digital data
DA0 The least significant bit (LSB) of the D/A data
DA11 The most significant bit (MSB)
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 the D/A data integrity through a single step update.
PCM-3718HO provides a precise fixed internal -5 V or -10 V reference,
selectable by means of jumper JP10. This reference voltage is available at
connector P1 pin 20. 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 out-
put ranges are 0 to +10 V or 0 to -10 V.
Connector P1 supports all D/A signal connections. Chapter 2 shows con-
nector pin assignments, while chapter 3 has a wiring diagram for D/A sig-
nal connections.
Table 4.2: Register for D/A Output Data
Write
D/A Output Data
Bit # 7 6 5 4 3 2 1 0
BASE+04H DA3 DA2 DA1 DA0 X X X X
BASE+05H DA11 DA10 DA9 DA8 DA7 DA6 DA5 DA4

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Productinformatie

MerkAdvantech
ModelPCM-3718H
CategorieNiet gecategoriseerd
TaalNederlands
Grootte5483 MB