ID Register
b +00
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Undefined
(Logical Address)
Read*
Reg-Base
A16
Manufacturer ID
* Returns FFFF
h
= Hewlett-Packard A16 only register-based
Device Type Register
b +02
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write
Undefined
Read*
1 (A16 only)
Module ID Code
* Returns: FF08
h
=48-Channel Single Ended Relay Multiplexer (E1346A)
Status/Control Register
b +04
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write*
Undefined
R
Read**
B
* R = Multiplexer reset to power-on state (all switches open) ** B = Status "busy" is true low in bit #7 (FF7F
h
)
Tree Switch Register
b +06
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write*
Undefined
93
92
91
90
Read
Always returns FFFF
h
* Write "1" closes switch, write "0" opens switch
Channel Register and Corresponding Tree Switch Bits
b +06
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write*
90
b +08
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write*
CH31 CH30 CH29 CH28 CH27 CH26 CH25 CH24 CH07 CH06 CH05 CH04 CH03 CH02 CH01 CH00
b +06
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write*
91
b +08
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write*
CH39 CH38 CH37 CH36 CH35 CH34 CH33 CH32 CH15 CH14 CH13 CH12 CH11 CH10 CH09 CH08
b +06
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write*
92
b +08
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Write*
CH47 CH46 CH45 CH44 CH43 CH42 CH41 CH40 CH23 CH22 CH21 CH20 CH19 CH18 CH17 CH16
Read
Always returns FFFF
h
* Write "1" closes channel, write "0" opens channel
Figure B-3. Multiplexer Register Definitions
Appendix B
HP E1346A Multiplexer Registers 69
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