Dicon VX500, Руководство по эксплуатации, Страница: 17 / 24

October 20, 1998
Switch Control 17
Switch Control
Figure 13 illustrates the following sample control sequence for a 1
×
N simplex switch.
1. Following power-up, the switch returns to reset position. After the initialization period,
the device is ready to receive instructions.
2. The user brings STROBE high, brings RESET high to enable channel selection, and
sets the desired channel address. The user applies a strobe pulse, sending the BUSY
line high while the switch moves into alignment with channel 6. The BUSY line returns
to low when the switch operation is complete and the device is ready to accept new
instructions.
3. With the RESET line still high, the user changes the channel address and applies
another STROBE pulse, the BUSY line goes high while the switch moves into align-
ment with channel 2.
4. Finally, the user brings RESET low and applies another STROBE pulse. The device
disregards the channel address inputs. The BUSY line goes high while the switch
returns to the reset position.
Figure 13: Sample Control Sequence
Power Up
Auto Reset
Not
Valid
Read
00001
Channel 6
Ready
Not
Valid
Read
00101
Not
Valid
Channel 0
Reset
Ready Ready
Channel 2
Reset
Request
Not
Valid
Ready
Channel
Reset
+12 VDC
STROBE
D1
D0
D3
D2
RESET
BUSY
OUTPUT
CHANNEL
D4
SWITCH
FUNCTION
Off
Not
Valid
1 2 3 4