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M - Service Request Mask
SYNTAX
Mmask
Define the Service Request (SRQ) conditions, where 00 ≤ mask ≤ 31, as summed
from the following states:
•
0 - (Default) SRQ is disabled.
•
1 - SRQ on Service input transition.
•
2 - SRQ on EDR input transition.
•
4 - SRQ on IEEE 488 bus error.
•
16 - SRQ on Ready.
Note:
The Service Request Mask commands are
ORed together as received. To delete
any one command, it is necessary to program the default mode M0, then
reprogram the desired commands.
DESCRIPTION
The Service Request Mask (
M) command is used by the Digital488/80A to alert the controller to one of several
conditions described below. Multiple Service Request (SRQ) conditions can be enabled simultaneously by issuing
them separately or by combining them in one command string. If multiple Service Request Mask commands are
contained within the same command string, each command must be followed by an Execute (
X) command. An
alternative is to add up the values of each Service Request Mask command desired, and send a single command with
the sum of the desired commands. The Service Request Mask commands are
ORed together as received. To delete
any one command, it is necessary to program the default mode
M0, then reprogram the desired commands. The
programmed
SRQ modes will remain enabled until the M0 command is sent, or the controller sends a Device Clear
(
DCL) or Selected Device Clear (SDC).
Default mode
M0 disables the SRQ function, preventing the Digital488/80A from generating a Service Request.
Mode
M1 enables the Digital488/80A to generate a Service Request when the Service input line makes a transition.
Refer to the Invert (
I) command for programming the polarity of the Service input line.
Mode
M2 enables the Digital488/80A to generate a Service Request when the EDR input makes a transition. Refer to
the Invert (
I) command for programming the polarity of the EDR input line.
Mode
M4 enables the Digital488/80A to generate a Service Request when a bus error occurs. The most common bus
error is sending an invalid command to the Digital488/80A. For example, when mode
M4 is selected, selecting Data
Format F6 (which does not exist) causes the Digital488/80A to generate a Service Request.
Mode
M16 enables the Digital488/80A to generate a Service Request when it has completed the execution of a set of
commands from the bus controller. This may be used by the controller to assure the completion of a set of commands
before sending a subsequent set of commands.
EXAMPLE 1: Invalid Command.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;M4X"
Line 2: Select SRQ on bus error.
PRINT#1,"OUTPUT08;W7X"
Line 3: Send an invalid command (no W command exists).
Note: ERROR and SRQ LED indicators should illuminate.
EXAMPLE 2: Alternative command strings.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;M1X M4X"
Line 2: Select SRQ on bus error, and SRQ on Service input transition.
PRINT#1,"OUTPUT08;M5X"
Line 3: This command string would have the same effect as the command
string sent in the line above where
M1X plus M4X equals M5X.
62 Digital488/80A Commands
967695 Digital488/80A User's Manual
- User's Manual 1
- Introduction to this Manual 3
- Table of Contents 4
- 7 - Troubleshooting 5
- A - Appendix A 5
- B - Appendix B 5
- Digital488/80A Overview 1 7
- Accessories 8
- Specifications 9
- CAUTION 10
- Data Transfer Speeds 10
- Digital488/80A Setup 2 11
- Hardware Setup 12
- Default DIP Switch Settings 13
- Addressing Mode Selection 13
- Secondary Address Settings 14
- HVCX1 Option Setup 16
- WARNING 16
- Digital I/O Ports 23
- Introduction 25
- Line Voltage Selection 26
- Fuse Replacement 28
- Rack Mount 29
- Bench Top 29
- Power-Up Activation 30
- Programming Examples 31
- C0 is in use 33
- C) command C5 was executed 33
- Digital488/80A Operation 4 35
- Clear (Pin 41) 36
- Data Strobe (Pin 42) 36
- Trigger (Pin 36
- Inhibit (Pin 44) 37
- Service (Pin 45) 37
- External Data Ready (Pin 46) 37
- IEEE 488 Bus Support 38
- 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
- Digital488/80A Commands 6 47
- Command Syntax 48
- Command Set & Support 49
- Command Summary 50
- - SRQ on Ready 51
- Command Reference 52
- A - Bit Set 53
- B - Bit Clear 54
- C - Configuration 55
- D - Data Output 56
- E? - Query Error Status 57
- F - Data Format 59
- G - Bus Input/Output 63
- H - Handshake 64
- I - Invert 65
- K - End-Or-Identify 66
- L - Buffer 67
- M - Service Request Mask 68
- O - Recall Configuration 69
- P - Port Select 70
- Q - Inhibit 71
- R - Data Ready 72
- S - Save Configuration 73
- T - Test 74
- U - User Status 75
- V - View Configuration 78
- V? - View Version 79
- X - Execute 80
- Y - Bus Terminator 81
- ? - Query 82
- Serial Poll Status Byte 83
- Troubleshooting 7 85
- Buffer Overrun 86
- Query Error Status 86
- Appendix A A 87
- Software Setup 88
- Appendix B B 91
- IEEE 488 Bus Commands 92
- ASCII Codes 93
- ASCII Code Details 95
- Abbreviations 104
- Notes 106
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