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Scan Channel
Configuration
Register
base + 0A
15
14
16
Write
VLD* A_D* B_D*
Read
D3 - D0
Configuration Bit
(C1 - C0)
B and A Tree Isolation
Switch Disable
(B-D*, A-D*)
Valid Channel (VLD*)
Direct Channel
Configuration
Register
base + 0C
15
14
16
Write
Read
D3 - D0
Appendix B
These bits set the <channel_list> for a scan list, set the type of measurement
and enable/disable the tree isolation switches. Note that the DIR in the
Status/Control Register must be set false to enable this register.
13
12
11
10
C1
C0
X
These bits set the channel number, with a range of 0 - 15. Bit D0 is the least
significant bit, and bit D3 is the most significant.
These bits determine the measurement mode as listed below:
C1
C0
0
0
0
1
1
1
1
0
Note that to obtain the Thermistor reference temperature for Thermocouple
measurements, you must set the configuration bits for Thermistor. After
you have obtained the reference temperature, set the bits for Volts.
A zero in either one disables the respective Tree Isolation Switch.
Generally, both disabled together equal the
command.
A zero indicates that the specified channel is valid. When entering a scan
list the entire list must be loaded into each module. For the channels that
are not on that module, the VLD* must be set false. See
the " Executing Commands" section in this Appendix.
The Direct Channel Register allows you to specify channels to be closed
individually. Note that the DIR bit in the Status/Control Register must be
set true for this register to be enabled.
13
12
11
10
Undefined
These data bits set the channel number with a range of 0 - 15. Bit D0 is the
least significant bit, and bit D3 is the most significant.
HP E1351A/53A Register-Based Programming 89
9
8
7
6
X
X
X
X
Undefined
Volts
2-wire ohms
4-wire ohms
Thermistor
9
8
7
6
X
X
Undefined
5
4
3
2
X
X
D3
D2
[ROUTe:]SCAN:PORT NONE
[ROUTe:]SCAN
5
4
3
2
X
X
D3
D2
1
0
D1
D0
in
1
0
D1
D0
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