Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 320)

III. COMMAND REFERENCES - 15. Command References 15A. Driver488/DRV Commands
Personal488 User’s Manual, Rev. 3.0 III-305
EXAMPLES See next page.
EXAMPLES PRINT#1,"REQUEST“;64+2+4 Generate an SRQ (decimal 64) with DIO2
(decimal 2) and DIO3 (decimal 4) set in
the Serial Poll Response.
PRINT#1,"REQUEST 0" Clear SRQ and Serial Poll Response.
In Peripheral mode, Driver488 is able to request service from the Active Controller by asserting the
Service Request (
SRQ ) bus signal. The REQUEST command sets or clears the Serial Poll status
(including Service Request) of Driver488. REQUEST takes a numeric argument in the decimal range
0 to 255 (hex range &H0 to &HFF ) that is used to set the Serial Poll status. When Driver488 is Serial
Polled by the Controller, it returns this byte on the DIO data lines.
The data lines are numbered DIO8 through DIO1 . DIO8 is the most significant line and corresponds to
a decimal value of 128 (hex &H80 ). DIO7 is the next most significant line and corresponds to a
decimal value of 64 (hex &H40 ). DIO7 has a special meaning: It is the Request for Service ( rsv ) bit. If
rsv is set, then Driver488 asserts the Service Request ( SRQ ) bus signal. If DIO7 is clear (a logic 0 ),
then Driver488 does not assert SRQ . When Driver488 is Serial Polled, all eight bits of the Serial Poll
status are returned to the Controller. The rsv bit is cleared when Driver488 is Serial Polled by the
Controller. This causes Driver488 to stop asserting SRQ .
RESET
SYNTAX RESET
RESPONSE None
MODE Any
BUS STATES None
SEE ALSO ABORT, TERM, TIME OUT
EXAMPLE PRINT#1,”RESET”
The RESET command provides a warm start of the interface. It is equivalent to issuing the following
command process, including clearing all error conditions:
1. STOP
2. DISARM
3. Reset hardware. (Resets to Peripheral if not System Controller)
4. ABORT (if System Controller)
5. ERROR ON
6. FILL$0
7. LOCAL
8. REQUEST 0 (if Peripheral)
9. Clear Change , Trigger , and Clear event conditions.
10. Reset I/O adapter settings to installed values. ( TIME OUT , INT LEVEL , and DMA CHANNEL )
RESUME
SYNTAX RESUME [MONITOR] [name]
name is either an I/O adapter or an external device. If name is an external device,
then the device’s output terminators are used. If name is a hardware interface,
then the default input terminators are used. If name is not specified, then
RESUME acts as if the hardware interface was specified.
MONITOR is a flag that when specified, Driver488 monitors the data.
RESPONSE None
MODE CA
BUS STATES *ATN
SEE ALSO FINISH
EXAMPLE PRINT#1,"RESUME" Unassert Attention Line.