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Chapter 24 Channel Selections

23-1

23. CHANNEL SELECTIONS

Channel selection allows the random ordering of channels to be programmed into the board channel RAM

list.

The Pci5500MF has 8 channels of single-ended analog inputs multiplexed to a 12-bit A/D converter and

supported by 176 elements of channel list RAM. This allows the board to access channels 0 to 7 in any

order.

The Pci55xx Series has 16 channels of analog inputs with programmable gain that’s multiplexed to the 12

or 16-bit A/D converter and supported by 176 elements of channel list RAM. This allows the board to

access channels and gains from 0 to 7 Differential and 0-15 Single Ended or Pseudo Differential in any

order.

23.1 AL_SetChannelList

Prototype C\C++

ERRNUM AL_SetChannelList(LHLD lhld, LPCHANLIST lpchanlist);

Visual Basic for Windows

Function AL_SetChannelList(ByVal lhld As Long,

lpchanlist As CHANLIST) As Long

LHLD lhld handle of the LDSD

LPCHANLIST lpchanlist address of the user channel list structure

The AL_SetChannelList function sets the active channel and gain settings in the LDSD. If a device

supports gain settings, the list is considered a channel and gain list, and must be set appropriately. See

examples below.

Parameter Description

lhld Identifies the instance of the logical device subsystem.

lpchanlist Specifies a 32 bit far pointer to a channel information structure. This

structure has been predefined in the ADLIB include file and is defined

as follows:

typedef struct tagCHANLIST

{

long lType; /* 0 = Not Defined */

/* 1 = Use string list */

/* 2 = Use array of numbers */

char achChannelList[MAX_CHANLIST_STRLEN];

long lNumElements;

long alChannelList[MAX_CHANLIST_ARRAYLEN];

}CHANLIST;

typedef CHANLIST FAR * LPCHANLIST;

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Measurement-computing ADLIB WIN Manual de usuario Pagina 95