
Functions > di_copy_mux

Syntax

di_copy_mux allows you to retrieve a description of each bank of 16 channels on DI-400, DI-500 Series, DI-720, and DI-730 instruments.

Syntax

int di_copy_mux(dest);
int *dest;	/* pointer to 16-word buffer */

Parameters

dest is a pointer to a 16-word buffer that will contain data describing the channels (as defined in Remarks below).

Return Value

DI_NO_ERR	No error
DI_OPENED_ERR	Device not opened
DI_INFO_ERR	Device is not a DI-400 Series, DI-500 Series, DI-720, DI-730, or DI-5001 instrument

Dependencies

none

Remarks

Each byte describes a bank of 16 channels. The first two bytes are reserved, the third byte is for channels A1 through A16, the fourth is for A17 through A32, etc. In each byte, the bit assignments are as follows:

bit 7	bit 6	bits 5, 4, 3	bit2	bit 1	bit 0
PGH/PGL	Input Type	Channel	MUX	Cable	HV Option

Bit 7: PGH/PGL Status

This bit describes the MUX gain status. When set, the MUX is low gain PGH (programmable ain factors 1, 2, 4, and 8). When clear, the MUX is high gain PGL (programmable gain factors 1, 10, 100, and 1000 on DI-500 Series instruments or 1, 10, and 100 on DI-400 Series instruments).

Bit 6: Input Type

This bit describes the input type. When set, the inputs are signal conditioned (DI-5B amplified). When clear, the inputs are high-level.

Bits 5, 4, and 3: Channel status

These bits contain bits one through three of the primary channel to which the MUX connects (bit 4 of the primary channel is always 1, and bit 0 is 1 for odd channels or 0 for even channels).

Bit 2: MUX status

This bit describes the MUX status. When set, MUX is not present. When clear, MUX is present.

Bit 1: Cable status

This bit describes the cable status. When set, the cable is not defective. When clear, the cable is defective.

Bit 0: High voltage option status

This bit describes the high voltage option status of the bank of 16 channels. When clear, this bank of 16 channels has high voltage measurement capability. When set, this bank of 16 channels does not have high voltage measurement capability.

Sample Code

main()
{
int mux_infor[16];
di_open();
di_copy_mux(mux_info);
di_close();
}