System information

Installing Hardware Options
MicroVAX 3100 Models 88/98 User Information
3-15
Table 3-2 Communication Option Slot Locations
Figure Legend Communication Device
1 KZDDA (External SCSI)
2 Reserved
3 Reserved
4 DSW43 (Synchronous)
5 DHW42 (Asynchronous)
Synchronous Communication Option
The MicroVAX 3100 88/98 systems support the DSW43-AA synchronous communications
option. This communications option provides two synchronous communications ports and
allows you to connect the system to a peripheral that uses an EIA-232 (V.24) 25-pin
connector via a 2-ft cable. You can use other interface standards with this option if you
order different cables. Table 3-3 lists each interface standard and the part number of the
corresponding cable. The BC19
x
-02 cables listed in are 2-foot cables; you must order the
extension cables separately. Contact your Digital sales representative for information on
ordering any of the different cables that support these interface standards.
Table 3-3 Interface Standards and Cable Part Numbers
Interface Standard Cable Part Number Extension Cable Part Number
EIA-232/V.24 BC19D-02 BC22F-
nn
(10, 25, or 50 ft)
EIA-432/V1.0 BC19E-02 BC55D-
nn
(25 or 50 ft)
EIA-422/V.11 BC19B-02 BC55D-
nn
(25 or 50 ft)
Installing the Synchronous Communication Option
The MicroVAX 3100 88/98 systems support the DSW43-AA synchronous communications
option. To install it, refer to Figure 3-11 and follow these instructions:
1. Turn off the system, unplug the power cord and remove the cover.
2. Insert the module into the slot of the I/O receiver, pressing it firmly into place to seat
the connection.