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int anaOut(unsigned int channel,
unsigned int rawcount);
Sets the voltage of an analog output channel by serially clocking in 16 bits to a D/A converter using the
following format:
? Program bits (D15…D12)
? New data (D11…D0)
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
R1
SPD PWR
R0
MSB
12 data bits MSB–LSB (0–4095)
LSB
SPD—Speed control bit: 1 = fast mode (default), 0 = slow mode
PWR—Power control bit: 1 = power down, 0 = normal operation (default)
The following table lists all the possible combinations of the register-selects bits R1
(Register 1) and R0 (Register 0)
R1
0
0
1
1
R0
0
1
0
1
Register
Write data to D/A converter channel B
Write data to buffer
Write data to D/A converter channel A
Reserved
PARAMETERS
channel is the D/A converter output channel to write. channel should be passed as
channel = (slotnumber * 128) + (channelnumber)
where slotnumber is 0–6, and channelnumber is 0–7
or
channel = ChanAddr(slotnumber, channelnumber)
where slotnumber is 0–6, and channelnumber is 0–7.
rawcount is a value corresponding to the voltage on the analog output channel (0–4095). The follow-
ing rawcount data correspond to the analog outputs indicated.
Approximate Output Equivalent
rawcount
SR9400
SR9410
SR9420
0 (0000H)
2047 (07FFH)
4095 (0FFFH)
+10 V
+5 V
0V
+10 V
0V
–10 V
20 mA
12 mA
4 mA
RETURN VALUE
0 if successful.
–1 if rawcount is greater than 4095.
SEE ALSO
anaOutVolts, anaOutCalib
110
Smart Star D/A Converter Cards (SR9400)
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