1260-134 User Manual
Racal Instruments
Ó
2003
Module Operation 3-7
Table 3-1, Control Register Channel Assignments
Channels
Control
Register
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
0 130 131 132 133 140 142 143 150
1
152 122 123 Unused
Unused 141 151 153
2 113
Unused
120
121
101
100
Unused
93
3 92
81
111
112
110
103
102
Unused
4 72 73
Unused
80 82 83 90 91
5 32 31
Unused
61 62 63 70 71
6 53 52 51 42 41 40
Unused
33
7
3
10
11
30
23 Unused 60 Unused
8
2 13 43 50
Unused
20 21 22
9
12
Unused Unused
Unused Unused Unused
0
1
Setting a control bit to 1 closes the corresponding channel, and
clearing the bit to zero opens the corresponding channel. Thus, if
you write the value 1000 0101 binary = 133 decimal = 85
hexadecimal to Control Register 0, channels 130, 142, and 150 will
close, while channels 131, 132, 133, 140, and 143 will open.
The present control register value may be read back by reading an
8-bit value from the control register address.
The value is
inverted.
In other words, the eight-bit value read back is the one’s
complement of the value written.
If you want to change the state of a single relay without affecting
the present state of the other relays controlled by the control
register, you must:
1. Read the control register
2. Invert the bits (perform a one’s complement on the register
data)
3. Perform a bit-wise AND operation, leaving all but the
specific control register bit for the relay to change
4.
To open
: continue to step 5.
To close
: OR in the bit for the
relay to close.
5. Write the modified value back to the control register.
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