9
CHAPTER 3: Installation
3.3 Jumper Settings
Refer to Figure 1 on page 6. Shunt W1 is used to
select DTE/DCE operation. This eliminates the need
to use a crossover cable when connecting to your
data-communications equipment.
If you connect the High Speed SHM-B Async to your
equipment using a straight-through cable, then W1
must be set to the opposite of your device’s
configuration. For example, if your device is
configured as DTE, select DCE via W1.
If you use a crossover cable to connect the High
Speed SHM-B Async to your equipment, then the
setting for W1 will be identical to your equipment’s
setting. Refer to your equipment’s manual for
information concerning its DTE/DCE setting.
3.4 Flow Control
H
ARDWARE
H
ANDSHAKING
(J
UMPER
W2
IN THE
A-B [E
NABLED
] P
OSITION
)
When the High Speed SHM-B Async is set for DCE
operation (shunt jumper in the W1B position), DTR
or RTS asserted true (high) from the attached RS-
232 device activates the High Speed SHM-B Async
driver circuit. When the High Speed SHM-B Async
is set for DTE operation, CTS or DSR from the
attached RS-232 device activates the driver circuit