HP 8340A Operating Manual page 156

Operating Information
.HP 85A HP-IB Control Registers
Register
7
Number
CRO x
CR1 IFC
CR2
x
CR3
DI08
HP 9826/9836 HP-IB READIO Register 23
Most Significant Bit
Bit 7
Bit 6
ATN DAV
True True
Value= 128 Value= 64
*Only if addressed to TALK, else not valid.
**Only if Active Controller, else not valid.
HP 9826/9836 HP-IB READIO Register 31
Most Significant Bit
Bit 7
Bit 6
DI08
DI07
Value= 128 Value= 64
HP 9826/9836 HP-IB WRITE10 Register 31
Most Significant Bit
Bit 7 Bit 6
DI08 DI07
Value= 128 Value= 64
3-92
Bit Number
6 5 4 3
x Odd
x x
LA CA TA SRO
ATN EOI
REN SRO
DI05 DI04
DI07 DI06
Bit 5 Bit 4
NDAC* NRFD*
True True
Value= 32 Value= 16
Bit 5 Bit 4
DI06 DI05
Value= 32 Value= 16
Bit 5 Bit 4
DI06 DI05
Value= 32 Value= 16
Figure 3-28. Representative Control Registers
Scans by HB9HCA and HB9FSX
0
2 1
Always Always
Even One Zero
DCL or
SDC GET SCG
NDAC NRFD
DAV
DI02 DI01
DI03
Bit 3 Bit 2
EOI SRO**
True True
Value= 8 Value= 4
Bit 3 Bit 2
DI04 DI03
Value= 4
Value= 8
Bit 2
Bit 3
DI04 DI03
Value= 8 Value= 4
Model 8340A
Default Register
Value Function
Parity
Control
0
Interrupt
0 Mask
HP-IB
Not
Applicable Control Lines
HP-IB
Not
Applicable Data Lines
Control-Line Status
Least Significant Bit
Bit 0
Bit 1
IFC REN
True True
Value= 2 Value= 1
Bus Data Lines
Least Significant Bit
Bit 1 Bit 0
DI02 DI01
Value= 2 Value= 1
Data-Out Register
Least Significant Bit
Bit 1 Bit 0
DI01
DI02
Value= 2 Value= 1