ScannerMAX Mach-DSP, Руководство пользователя

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Mach-DSP User’s Manual
Document Number: MACH-DSP-9021
Page 18
www.ScannerMAX.com
3.3 Status and Control signals
The status/control signal interface is located in the left side of the board near the front.
System I/O includes optically-isolated inputs and outputs facilitated through optical
isolators having part number MOCD207M. The pin functions are described in Table 3.3:
Table 3.3: Status / Control Interface
Pin Function
1 Collector of isolated output 1
2 Collector of isolated output 2
3 Cathode of isolated input 1
4 Cathode of isolated input 2
5 Emitter of isolated output 1
6 Emitter of isolated output 2
7 Anode of isolated input 1
8 Anode of isolated input 2
Mating Connector Housing: MOLEX Micro-Fit Jr: 0430250800
Mating Connector Pins: 0430300001 through 0430300012
Specified Wire Size: AWG #20-#30, depending on pin type
Optically-isolated Inputs
The Mach-DSP features two separate TTL-level inputs, facilitated as LED inputs of
optical isolators. These inputs that can be programmed to respond in a variety of ways,
using the “Control” tab of the Mach-DSP PC application. For example, these inputs may
be used as an external “SERVO ENABLE” signal that will enable the servo driver when
the laser Machine is ready for use, but disable the servo driver and place it in standby
otherwise. Another example use is to use one or both of these inputs to select scanner-
tunings on the fly.
(Although the isolation offered is greater than 500 volts, you
should not exceed greater than +/- 6V across the Anode/Cathode terminals.)
Optically-isolated Outputs
The Mach-DSP also features two separate “TTL” outputs, facilitated as open-collector
phototransistor outputs of optical isolators. These TTL outputs that can be programmed
to respond in a variety of ways, using the “Control” tab of the Mach-DSP PC application.
For example, one or both of these outputs can be used as a “Fault” indication – to
indicate that the servo has encountered an over-temperature or over-position fault.
Another example use is to use one or both of these outputs as a “Settled” indicator, to
indicate when the servo position error has reached a suitably low value, indicating that
the mirror has reached its commanded position.
(Although these “TTL” outputs will
typically be used with TTL-level voltages, they support up to 30V across each
phototransistor, and up to 150mA flowing through each phototransistor.)