Asyst Technologies VersaPort 2200, Техническое руководство

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Released Rev. C 2000-1252-01 Page 31
VersaPort 2200 Technical Manual
Chapter 2: Theory of Operation
VersaPort Components
a
1. I/O signals with shared labels (such as OPEN/CLOSE) are multi-purpose, with the specific
function depending on the status of other signals.
2. All I/O signals are active low.
3. Input signals are strobed. Minimum effective strobe length is 50 milliseconds.
4. Minimum time from one transition signal to another is 20 milliseconds.
5. To ensure complete electrical isolation (recommended) between the host and the VersaPort I/O,
the input/output power must be provided by the Host at J10 pins 1&13, and the output signal
ground also provided by the Host at J10- pins 14 & 25. W22 pins 1 &2 on the I/O board must be
jumpered and no jumper on W26 installed.
6. To use the VersaPort DC power and ground for input/output voltage and output signal return,
jumper W22 pins 2 & 3 and jumper W26. Connect J10 pins 20 &21 to pins 14 & 15.
NOVRAM
There are two sets of data (configuration and history) that are written to and retrieved
from the NOVRAM during VersaPort operation. The NOVRAM data is updated whenever
changes have occurred.
Configuration
The configuration data, Equipment Constant Identification (ECID), is written to the
NOVRAM and updated as necessary to provide repeatable VersaPort operation
parameters. A complete description of ECID values and default settings is provided in the
Communications Software section of this manual.
History
The history file contains information that is incremented at each event and stored for the
life of the NOVRAM. The data stored is:
• Power up. The number of times the VersaPort has had power applied to it.
24 Output ERROR 8 mA @ 0.4V
3 Connected internally to chassis ground.
17 Factory test usage; Do not connect to these pins.
18 Factory test usage; Do not connect to these pins.
23 Factory test usage; Do not connect to these pins.
Pin
No.
To use external Host DC voltage and
ensure electrical isolation
(see note 5)
To Use VersaPort DC Voltage
(see Note 6)
1 & 13 Connect to Host +5 VDC Do not connect.
14 &
25
Connect to Host signal return. Connect to pin(s) 20 and/or 21
20 &
21
Do not connect. Connect to pin(s) 14 and/or 15
T
ABLE
3 Parallel Communications Interface - Asyst Compatible (Continued)