Visara SCON-25L Reference Manual - Manual (Page 22)

SCON-25L/28L/3074 Console Concentrator
1174-25S Communications Server Hardware Reference Manual
2-12 707028-007
Prior to installing a new set of cables, you should label both ends of one cable Bus
and both ends of the remaining cable Tag to ensure that you attach the cables to
the proper receptacles.
The unit may be connected to the end of a channel, the middle of a channel, or
replace an existing unit on a channel. Follow the instructions appropriate for your
installation.
Connecting a Unit to the End of a Channel
Refer to Figure 2-6.
1. Ensure that the host processor/channel is in a stop state before disconnecting
any channel cables or terminator blocks.
2. Label each end of one of the new channel cables Bus; label each end of the
other new channel cable Tag.
3. Connect the light colored ends of the new Bus and Tag cables to the Bus In
and Tag In receptacles on the BTC-C
4. Remove the terminator blocks from the existing unit at the end of the channel.
Ensure that they are identified as Bus and Tag as they are removed so they will be
reconnected in the correct receptacles.
5. Connect the dark colored ends of the new Bus and Tag cables to the Bus Out and
Tag Out receptacles of the existing unit.
6. Connect the terminator blocks to the Bus Out and Tag Out receptacles of
the BTC-C.
Note: If unit fails to communicate when positioned on the end of the channel, it
is suggested that you try locating it in another position on the channel.
Some non-Visara controllers that are positioned on the end of the channel
utilize an internal channel terminator, and the channel signals are not
propagated beyond itself.
Unit
Figure 2-6. Connecting to the End of a Channel