Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 318)

III. COMMAND REFERENCES - 15. Command References 15A. Driver488/DRV Commands
Personal488 User’s Manual, Rev. 3.0 III-303
EXAMPLE PRINT#1,
"PPC23;&H0D"
Configure device 23 to assert DIO6 when it desires service (ist =
1) and it is Parallel Polled (&H0D = 1101 binary; S=ist=1,
P2=1, P1=0, P0=1; 101 binary = 5 decimal = DIO6).
The PPOLL CONFIG command configures the Parallel Poll response of a specified bus device. Not all
devices support Parallel Polling and, among those that do, not all support the software control of their
Parallel Poll response. Some devices are configured by internal switches.
The Parallel Poll response is set by a four-bit binary number response: S , P2 , P1 , and P0 . The most
significant bit of response is the Sense ( S ) bit. The Sense bit is used to determine when the device will
assert its Parallel Poll response. Each bus device has an internal individual status ( ist ). The Parallel
Poll response is asserted when this ist equals the Sense bit value S . The ist is normally a logic 1
when the device requires attention, so the S bit should normally also be a logic 1 . If the S bit is 0 , then
the device asserts its Parallel Poll response when its ist is a logic 0 . That is, it does not require
attention. However, the meaning of ist can vary between devices, so refer to your IEEE 488 bus
device documentation. The remaining 3 bits of response: P2 , P1 , and P0 , specify which DIO bus data
line is asserted by the device in response to a Parallel Poll. These bits form a binary number with a
decimal value from
0 through 7 , specifying data lines DIO1 through DIO8 , respectively.
PPOLL DISABLE or PPD
SYNTAX PPOLL DISABLE addr[,addr...] or PPD addr[,addr...]
addr is a device address (primary with optional secondary) or an external device
name.
RESPONSE None
MODE CA
BUS STATES ATN
•UNL, MTA, LAG, PPC, PPD
SEE ALSO PPOLL, PPOLL CONFIG, PPOLL UNCONFIG
EXAMPLE PRINT#1,”PPOLL DISABLE
18,06,13”
Disable Parallel Poll of devices 18, 6, and 13.
The PPOLL DISABLE command disables the Parallel Poll response of selected bus devices.
PPOLL UNCONFIG or PPU
SYNTAX PPOLL UNCONFIG or PPU
RESPONSE None
MODE CA
BUS STATES ATN
•PPU
SEE ALSO PPOLL, PPOLL CONFIG, PPOLL DISABLE
EXAMPLE PRINT#1,"PPOLL UNCONFIG"
The PPOLL UNCONFIG command disables the Parallel Poll response of all bus devices.
REMOTE
Bus Addresses Not Specified
SYNTAX REMOTE
RESPONSE None
MODE SC
BUS STATES REN
SEE ALSO Remote (Sub-Chapter 15B)
EXAMPLES PRINT#1,"REMOTE" Assert Remote Enable