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Control Byte (Servo Motor
Amplifier Inhibit)
Table 3.A
DAC Input/Output
Sign Bit
Input Bit Pattern
0
111 1111 1111
0
111 1111 1110
0
111 1111 1100
0
000 0000 0011
0
000 0000 0010
0
000 0000 0001
0
000 0000 0000
1
111 1111 1111
1
111 1111 1110
1
111 1111 1101
1
111 1111 1100
1
000 0000 0011
1
000 0000 0001
1
000 0000 0000
(2)
(1) Low TRUE Bit Patterns
The 12 bit binary input to the DAC is transferred to two bytes using two
write instructions. The Most Significant BYte (MSBY) is eight bits long.
It can be loaded into memory location 600EH. DSEN Line 16 enables the
transfer. The Least Significant BYte (LSBY) can be loaded into memory
location 600DH. It contains data in the upper 4 bits. The lower 4 bits are
not used. DSEN line 15 enables the transfer. DAC data is reset at
power-up or by the data byte reset command (write location 600BH).
Bit 2 of the control byte is used to inhibit amplifier drive current to the
servo motor. Bit 3 is used to turn OFF the servo motor amplifier. They
are low = TRUE optically isolated TTL outputs.
Chapter 3
Programming and Operation
Analog Output Voltage
(1)
(3)
(2)= MSBY
10.000V
9.995V
9.990V
19.5mV
14.6mV
9.7mV
4.9mV
0
+4.9mV
+9.7mV
+14.6mV
+9.985V
+9.990V
+9.995V
(3) = LSBY
3 3
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