Technical data

Table 4–1 Interface Standards and Cable Part Numbers
Interface Standard Cable Part Number Extension Cable Part Number
EIA-232/V.24 BC19D-02
1
BC22F-nn
3
EIA-423/V.10 BC19E-02
2
BC55D-nn
4
EIA-422/V.11 BC19B-02
2
BC55D-nn
4
1
Supplied with the DSW42-AA option.
2
Optional cable, order separately.
3
Optional cable, order separately. The value of nn represents the cable length in feet (10, 25, or
50).
4
Optional cable, order separately. The value of nn represents the cable length in feet (25 or 50).
The BC19x-02 cables listed in Table 4–1 are 2-foot cables; extension cables
are also available, but you must order them separately. Contact your
Digital Sales representative for information on ordering any of the different
cables that support these interface standards.
• Asynchronous communications options—The system supports three
different asynchronous communications options. These options are as
follows:
– DHW42-AA—This asynchronous option provides eight asynchronous
DEC423 data-line-only communications lines through one system port.
You can connect up to eight peripherals using the MMJ ports on the
harmonica (H3104) that connects to the option cable (BC16C-10).
– DHW42-BA—This option is the same as the DHW42-AA, but provides
16 asynchronous DEC423 data-line-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-CA—This asynchronous option provides eight asynchronous
EIA-232 modem control lines through two system ports using two
breakout cables (BC29J-06).
– DHW42-UP—This upgrade option converts a DHW42-AA asynchronous
option to a DHW42-BA option.
4–2 Hardware Options