Data General AViiON Series, Customer Documentation

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Connecting External Devices to VME Option Boards
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014–001867
Figure 4–27 VSC/3i Device Connectors and Channel Configuration Tag
NOTE: You specify the characteristics of synchronous devices through your
communications software. Refer to the device-specific documentation and
your X.25, SNA, PAD, or other synchronous communications
documentation for information on setting characteristics, such as baud
rate, to conform to your system requirements.
The DG/UX operating system recognizes all VSC/3i controllers by the
device mnemonic vsxb, regardless of port configuration.
Synchronous devices connect to the VSC/3i board in your computer through cables
with male DB25 connectors at the controller end. For each port you must use the
correct cable for the type of electrical interface you select. For several interfaces ––
RS–530, RS–449, and X.21 –– you configure the port on the VSC/3i board in the
same way, but each type of device requires a different device cable. Select the
appropriate cable for each port as listed in Table 4–7.