Campbell-scientific SDM-AO4A Four Channel Analog Output Module Manual de usuario descargar pdf (Pagina 11)

SDM-AO4A Four Channel Analog Output

7.1 CRBasic

7.1.1 SDMAO4A Instruction

The SDMAO4A instruction is used to set the voltage to an SDM-AO4A.

The SDM-AO4A is backwards compatible with the SDMAO4

CRBasic instruction. Therefore, programs written using the

SDMAO4 instruction will work with an SDM-AO4A but will

not take advantage of any of the SDM-AO4A’s additional

features. If the older instruction is used, the device will use the

default option code 1.

NOTE

The SDMAO4A instruction has the following syntax:

SDMAO4A (Source, SDMAO4ADest, SDMAddress, SDMAO4AStartChan,

Reps, SDMAO4AOption )

The SDMAO4A instruction has the following parameters:

Source: The Source parameter is the variable or variable array that holds the

voltage(s), in millivolts, that will be sent to the SDM-AO4A(s). If multiple

SDM-AO4As are to be triggered with one instruction, this parameter must be

dimensioned to the total number of channels for all the devices being set (e.g.,

if all four channels are being set on two SDM-AO4 devices, Source must be

dimensioned to eight).

SDMAO4ADest: The SDMAO4ADest parameter is a variable that holds a

status code indicating success or failure of the instruction.

Response Code Description

240 Successful

241 Signature error

242 Current overload error

243 Current overload and signature error

A current overload error occurs when current overload protection is triggered

(130 mA, +/- 15 mA). A signature error usually indicates noise on the line.

Any other response code returned indicates failed communication.

SDMAddress: The SDMAddress parameter defines the address of the first

SDM-AO4A to which a voltage should be applied. Valid SDM addresses are 0

through 14. Address 15 is reserved for the SDMTrigger instruction.

SDMAO4AStartChan: The SDMAO4StartChan parameter is used to define

the first channel on the SDMAO4A that should be set. Any reps will occur on

subsequent channels.

Reps: The Reps parameter determines the number of SDM-AO4A output

channels that will be set. If this parameter is greater than four (i.e., voltage is

being set for more than one SDM-AO4 device), voltage is set on the next

consecutively addressed SDM-AO4A device. In this case, the SDM-AO4As

must have sequential SDM addresses.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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Campbell-scientific SDM-AO4A Four Channel Analog Output Module Manual de usuario Pagina 11