Measurement-computing DAC488 v.1 Manuel d'utilisateur Page 62
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56 DAC488 Commands DAC488 User’s Manual
Command Syntax Description
N
Number of Cycles
(Port Command)
Nval
Specifies the number of cycles through the buffer in the
waveform mode.
val
is 0 to 65535, where 0 is continuous.
N?
Returns the number of repetitions specified for use in the
waveform mode.
Notes:
The default value is 1.
O
Output Format
On
Where
n = 0, 1
or
2
.
(System Command)
O0
(Default) Sets output format to volts in ±10.0000 (fixed).
O1
Sets output format to volts in decimal bits.
O2
Sets output format to volts in hexadecimal bits.
O?
Returns current output format selected.
P
Port Select
Pn
Where
n = 1, 2, 3,
or
4
.
(System Command)
P1
(Default) Select DAC port 1.
P2
Select DAC port 2.
P3
Select DAC port 3. (DAC488/4 only)
P4
Select DAC port 4. (DAC488/4 only)
P?
Returns currently selected port.
Q
External Trigger
Mask
(System Command)
Qmask
Sets bits in the External Trigger Mask which specifies which the
active edge of the external input line and which ports will be
triggered upon a transition of that line.
Q-mask
Clears the specified bits in the external trigger mask.
Q0
Clears all bits in the External Trigger Mask.
Q?
Returns current External Trigger Mask.
Mask bits:
Bit 1
Enable trigger to DAC port 1. (decimal 1)
Bit 2
Enable trigger to DAC port 2. (decimal 2)
Bit 3
Enable trigger to DAC port 3. (decimal 4) (DAC488/4 only)
Bit 4
Enable trigger to DAC port 4. (decimal 8) (DAC488/4 only)
Bit 8
External input line edge sense: 1 = negative edge triggered
(decimal 128); 0 = positive edge triggered.
Notes:
The Bit 8 default value is 0.
R
Range Select
Rn
Where
n = 0, 1, 2,
or
3
.
(Port Command)
R0
Select DAC Ground range.
R1
(Default) Select DAC ±1 volt range.
R2
Select DAC ±5 volt range.
R3
Select DAC ±10 volt range.
R?
Returns DAC volt range.
Notes:
This command should not be used when Autorange is enabled.
S
System Defaults
Sn
Where
n = 0, 1, 2,
or
3
.
(System Command)
S0
Restores the factory default values to NV-RAM.
S1
Saves current settings as default values to NV-RAM.
S2
Restore Gain and Offset Calibration Constants.
S3
Saves current Calibration Constants to Calibration NV-RAM.
S?
Returns the last
Sn
command executed.
T
Command Trigger
Mask
Tmask
Sets bits in the Command Trigger Mask that specify which ports
will be triggered upon receipt of a Trigger command (
@
).
(System Command)
T-mask
Clears specified bits in the Command Trigger Mask.
T0
Clears all bits in the Command Trigger Mask.
T?
Returns current Command Trigger Mask.
Mask bits:
Bit 1
Enable trigger to DAC port 1. (decimal 1)
Bit 2
Enable trigger to DAC port 2. (decimal 2)
Bit 3
Enable trigger to DAC port 3. (decimal 4) (DAC488/4 only)
Bit 4
Enable trigger to DAC port 4. (decimal 8) (DAC488/4 only)
Notes:
The default value is 0.
- User's Manual 1
- Introduction to this Manual 3
- Table of Contents 4
- 7 - DAC488 Commands 5
- 8 - Troubleshooting 5
- A - Appendix 5
- DAC488 Overview 1 7
- Accessories 8
- Specifications 8
- DAC488 Setup 2 11
- Hardware Setup 12
- Default Settings 13
- Mode Selection 13
- Analog Output Ports 13
- Digital I/O Port 14
- DAC488 Power & Assembly 3 19
- Rack Mount 23
- Bench Top 23
- Power-Up Activation 24
- CAUTIONCAUTION 24
- Programming Examples 25
- Performance Verification 26
- DAC488 Operation 4 29
- Port Triggering 30
- Internal Buffer 32
- Control Modes 34
- Waveform Control Mode 35
- Multiple Port Synchronization 36
- User-Defined System Defaults 39
- IEEE 488 Bus Support 39
- Bus Commands 40
- Bus Addresses 40
- Bus Terminators 40
- IEEE 488 Background 5 41
- Bus Lines & Bus Commands 42
- Handshake Lines 43
- Data Transfer Lines 43
- Bus Command Groups 44
- More On Service Requests 45
- DAC488 Calibration 6 47
- Manual Calibration Procedure 48
- BASIC Calibration Program 49
- DAC488 Commands 7 57
- Command Groups 59
- Command Summary 60
- Command Reference 63
- @ - Trigger On Command 64
- A - Autorange 65
- B - Buffer Data 66
- C - Control Mode 67
- D - Digital Output 69
- E? - Query Error Status 70
- F - Buffer Definition 72
- G - GET Trigger Mask 73
- H - Offset Calibration 74
- I - Interval 75
- J - Gain Calibration 76
- K - End-Or-Identify Control 77
- L - Buffer Location 78
- M - Service Request Mask 79
- N - Number of Cycles 80
- O - Output Format 81
- P - Port Select 82
- Q - External Trigger Mask 83
- R - Range Select 84
- S - System Defaults 85
- T - Command Trigger Mask 86
- U - User Status 87
- V - Value Output 90
- W - Test 91
- X - Execute 92
- Y - Bus Terminator 93
- ? - Query 94
- Serial Poll Status Byte 95
- Troubleshooting 8 97
- Query Error Status 98
- Appendix A 99
- IEEE 488 Bus Commands 100
- ASCII Codes 101
- ASCII Code Details 103
- Decimal Values 32 to 63 – LAG 105
- Decimal Values 64 to 95 – TAG 106
- Abbreviations 112
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