Impulse 463E - Manual (Page 65)

© Sealevel Systems, Inc. - 62 - SeaI/O User Manual
(0x64) Set A/D, D/A Configuration
SeaI/O devices featuring analog to digital or digital to analog conversions can be
configured via a Modbus command. Upon a successful operation, the SeaI/O module
will respond with the response packet shown below.
Request Response
Field Name (Hex) Field Name (Hex)
Function 64 Function 64
Device Config 00
Channels 1-4 Config 00
Channels 5-8 Config 00
Channels 9-12 Config 00
Channels 13-16 Config 00
The configuration byte stream is defined as follows:
BYTE
BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
BIT
2
BIT
1
BIT
0
Device Config A/D Voltage Reference A/D Channel Mode
1-4 Config Ch 1 Range Ch 2 Range Ch 3 Range Ch 4 Range
5-8 Config Ch 5 Range Ch 6 Range Ch 7 Range Ch 8 Range
9-12 Config Ch 9 Range Ch 10 Range Ch 11 Range Ch 12 Range
13-16 Config Ch 13 Range Ch 14 Range Ch 15 Range Ch 16 Range
The actual values for the configuration options above (A/D Voltage Reference, A/D
Channel Mode, and A/D Ch xx Ranges) are enumerated in SeaMaxW32.h, included
with the SeaMAX libraries, and shown in the table below.
A/D Voltage Reference A/D Channel Mode Ch xx Ranges
ANALOG_OFFSET = 0 SINGLE_ENDED = 0 ZERO_TO_FIVE = 0
GND_OFFSET = 1 DIFFERENTIAL = 1 PLS_MIN_FIVE = 1
AD_REF_OFFSET = 2 CURRENT_LOOP = 2 ZERO_TO_TEN = 2
DA_CHANNEL_1 = 4 PLS_MIN_TEN = 3
DA_CHANNEL_2 = 8