Measurement-computing CIO-DAS800 Manuale Utente Scaricare il pdf (Pagina 13)

5 REGISTER MAP

Tables 4-1 and 4-2 contain the write and read functions of the board’s registers. Table 4-3 defines the

functions of each bit.

Note that the register at BASE + 2 is a multi-function register. Its function is set by bits CS0 and CS1 in

BASE + 3 register. Coding for Base + 02 register functions is contained in Table 4-4.

Table 4-5 gives the Gain Select codes for the CIO-DAS800.

NOTE: ONLY +/-5V IS SUPPORTED.

Table 4-6 provides special programming instructions.

Table 4-1. Register Map - Write Functions

FunctionData BitsWRITE

Functions

8254 Counter/Timer Control Register

Base + 7

Cascade Pre-scaler

8254 C/T 2 Control Register

Base + 6

A/D Timer

8254 C/T 1 Control Register

Base + 5

8254 C/T 0 Control Register

Base + 4

Control Select

R1R2R3

ENHFCS0CS1CSEBase + 3

Scan Limits Register

SC0SC1SC2EC0EC1EC2NANACS1/0=1/0

Conversion Control

ITECASCDTENIEOCEACSGTENNAHCENCS1/0=0/1

Control Register 1

MA0MA1MA2INTEOP1OP2OP3OP4CS1/0=0/0

Special Function

- (Depends on value of

CS0

)

Base + 2

Start Conversion*

Base + 1

Start Conversion

Base + 0

D0D1D2D3D4D5D6D7

* Writing (anything) to either BASE + 0 or BASE + 1 starts a conversion.

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Measurement-computing CIO-DAS800 Manuale Utente Pagina 13