Installing The Asynchronous Communication Option - Digital Equipment MicroVAX 3100 88 User Information

Use the following cables instead of the BC16C-10 cable if you require longer cable
lengths:
Use the following cables between the harmonica (H3104) and the DEC423 peripheral:
•
DHW42-CB -- This asynchronous option provides eight asynchronous EIA-232
modem control lines through two system ports using two breakout cables (BC29J-06).
Attach one of the following cables to a connector on the breakout cable if you require
longer cable lengths:
The peripheral you are using may require a null-modem extension cable. See the
peripheral documentation or contact your Digital sales representative for information on
the correct null-modem cable to use.

Installing the Asynchronous Communication Option

The MicroVAX 3100 88/98 systems support two different asynchronous communications
options, DHW42-BB and DHW42-CB in the top slot of the I/O receiver. To install either
of these, refer to Figure 3-12 follow these instructions:
1. Turn off the system, unplug the power cord and remove the cover.
2. Insert the module
to seat the connection.
BC16C-25, BC16C-50, BC16C-A0, or BC16C-B5.
BC16E-10, BC16E-25, or BC16E-50.
BC22F-10, BC22F-25, or BC22F-50.
c
into the top slot of the I/O receiver, pressing it firmly into place
MicroVAX 3100 Models 88/98 User Information 3-17
Installing Hardware Options