Spectrum M2p.59 Series, Hardware Manual, Page: 72 / 190

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Channel Selection Analog Inputs
Analog Inputs
Channel Selection
One key setting that influences all other possible settings is the channel enable register. A unique feature of the Spectrum cards is the possibility
to program the number of channels you want to use. All on-board memory can then be used by these activated channels.
This description shows you the channel enable register for the complete card family. However, your specific board may have less channels
depending on the card type that you have purchased and therefore does not allow you to set the maximum number of channels shown here.
.
The channel enable register is set as a bitmap. That means that one bit of the value corresponds to one channel to be activated. To activate
more than one channel the values have to be combined by a bitwise OR.
Single-ended inputs
1 single-ended channel enabled
Any one of the installed channels can be enabled. The following table shows example settings for the channel enable register:
2 single-ended channels enabled
Any two of the installed channels can be enabled. The following table shows three example settings for the channel enable register:
4 single-ended channels enabled
Any four of the installed channels can be enabled. The following table shows three example settings for the channel enable register:
8 single-ended channels enabled
Any channel activation mask that tries to enables a number of channels other than one, two, four or eight
channels is not valid. If programming an other channel activation, the driver will return with an error code
ERR_VALUE.
Table 23: Spectrum API: channel enable register: used to select the channels for the next acquisition/generation
Register Value Direction Description
SPC_CHENABLE 11000 read/write Sets the channel enable information for the next board run.
hex. dec.
CHANNEL0 1h 1 Activates channel 0
CHANNEL1 2h 2 Activates channel 1
CHANNEL2 4h 4 Activates channel 2
CHANNEL3 8h 8 Activates channel 3
CHANNEL4 10h 16 Activates channel 4
CHANNEL5 20h 32 Activates channel 5
CHANNEL6 40h 64 Activates channel 6
CHANNEL7 80h 128 Activates channel 7
Channels to activate Installed channels on card Value to program
Ch0 Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 1 2 4 8 Constant from regs.h hex decimal
X X X X X CHANNEL0 1h 1
X n.a. n.a. X X CHANNEL3 8h 8
X n.a. n.a. n.a. X CHANNEL6 40h 64
Channels to activate Installed channels on card Value to program
Ch0 Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 1 2 4 8 Constant from regs.h hex decimal
X X n.a. X X X CHANNEL0 | CHANNEL1 3h 3
X X n.a. n.a. X X CHANNEL1 | CHANNEL3 Ah 10
X X n.a. n.a. n.a. X CHANNEL3 | CHANNEL7 88h 136
Channels to activate Installed channels on card Value to program
Ch0 Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 1 2 4 8 Constant from regs.h hex decimal
X X X X n.a. n.a. X X CHANNEL0 | CHANNEL1 | CHANNEL2 | CHANNEL3 Fh 15
X X X X n.a. n.a. n.a. X CHANNEL1 | CHANNEL3 | CHANNEL4 | CHANNEL7 9Ah 154
X X X X n.a. n.a. n.a. X CHANNEL2 | CHANNEL3 | CHANNEL6 | CHANNEL7 CCh 204
Channels to activate Installed channels on card Value to program
Ch0 Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 Ch7 1 2 4 8 Constant from regs.h hex decimal
X X X X X X X X n.a. n.a. n.a. X CHANNEL0 | CHANNEL1 | CHANNEL2 | CHANNEL3 |
CHANNEL4 | CHANNEL5 | CHANNEL6 | CHANNEL7
FFh 255