Download Vector VEC010C System information

Installing Hardware Options
Asynchronous Communication Options
The VAX 4000 108 system supports two different asynchronous communications options.
These options are as follows:
•
DHW42-BB -- This asynchronous option provides 16 asynchronous DEC423 dataline-only communications lines through two system ports. You can connect up to 16
peripherals using the MMJ ports on two harmonicas (H3104) that connect to the
option cables (BC16C-10).
Use the following cables instead of the BC16C-10 cable if you require longer cable
lengths: BC16C-25, BC16C-50, BC16C-A0, or BC16C-B5. Use the following cables
between the harmonica (H3104) and the DEC423 peripheral: BC16E-10, BC16E-25,
or BC16E-50.
•
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: BC22F-10, BC22F-25, or BC22F-50. 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 VAX 4000 108 system supports two different asynchronous communications options,
DHW42-BB and DHW42-CB in the top slot of the I/O receiver. To install either of these,
follow these instructions:
1.
Turn off the system, unplug the power cord and remove the cover.
2.
Insert the module ™ into the top slot of the I/O receiver, pressing it firmly into place
to seat the connection.
VAX 4000 Model 108 User Information 3–19