Dicon VX500, Руководство по эксплуатации, Страница: 7 / 24

October 20, 1998
Switch Operation 7
Switch Operation
The twelve-pin interface is used for supply power, channel selection, and status checking.
The following table defines the signals associated with each pin.
Starting the Switch
To start the switch, apply power (+12 VDC ±5%, 300 mA max.) to the POWER line. A stable
voltage with less than 10 mV RMS ripple is recommended.
The switch requires a 970-ms initialization period upon power up while the switch armature
returns to reset position. Do not apply TTL input to the data lines (D0, D1, D2, D3, D4,
STROBE, and RESET) during initialization. Switch control may lock up if data is applied
during initialization. If the switch locks up, cycle the supply power and restart the switch.
During the 970-ms initialization period, the BUSY and ERROR outputs as well as the opti-
cal outputs are invalid.
Resetting the Switch
When the VX500 is in the reset position (also called the park position, channel zero, or opti-
cal off), there is no optical connection to any output channel. Set the switch to the reset
position to prevent optical data from passing through the switch, or to reset the stepper
motor. During a reset operation, optical noise may appear on various output channels as
the armature rotates.
Table 1: Interface Pin Assignments
Pin
Number Signal
Name Signal
Type
Description
1 GND Power Signal ground.
2 GND Power Power ground.
3 D0 Input The D0 input is the LSB of the channel address.
4 D1 Input The D1 input is bit 1 of the channel address.
5 D2 Input The D2 input is bit 2 of the channel address.
6 D3 Input The D3 input is bit 3 of the channel address.
7 D4 Input The D4 input is the MSB of the channel address.
8 STROBE Input The STROBE input is a falling-edge-trigger clock signal.
9 BUSY Output The BUSY output is high when the switch is busy, and low
when the switch is ready.
10 ERROR Output The ERROR output is low during normal operation. A high
ERROR output indicates that the requested channel is out of
range (user error) or that a stepper motor or proximity switch
error has occurred (device malfunction).
11 RESET Input Set RESET to low to return the switch to the reset position,
and to high to choose a different output channel.
12 POWER Power Power supply input (+12VDC ±5%, 300mA max.)
Warning
Applying TTL-level signals to the data lines before or during switch initialization may lock up
switch control. Do not apply TTL-level signals to the data lines until power has been applied to the
POWER input for 970ms.
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