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DIP Switch
Positions
Transmission
Mode (Full
duplex, half-
duplex, or
simplex)
Buffer
Allocation
Port A —
1/2, 3/4, 1/8
Port B —
1/2,1/4, 7/8
If one of your devices will do most, or all of the
transmission, you may assign it a larger portion of
the CAP buffer. Otherwise, assign half of the buffer
to each port.
Source of RX Enable
The CAP accepts
receive data only
if its receiver
is enabled.
DCD Enables
Receiver - when
DCD is active (High),
the CAP receives
data (half-duplex)
Receiver Always
Enabled — The CAP
can always receive
(full duplex)
Source of TX Enable
The CAP can
transmit only
when its trans-
mitter is enabled.
CTS enables the transmitter when input is active.
Choose if your device asserts DTR with a crossover
cable, or asserts CTS when it is powered on and/or
it can receive data. You must use this option if you
are using hardware flow control.
Transmitter Always Enabled — The CAP can always
transmit (software or no flow control).
Device A
Device B
________
________
________
________
Device A
Device B
________
________
________
________
3.2 Installing the User Programmable CAP
Before the User Programmable CAP can be
installed, you must program it to match your
specific application. You must set internal DIP
switches and jumpers. This is a very simple
procedure if you first fill out the checklist in the
previous section. The checklist will help you set the
DIP switches and jumpers in a logical order.
This section explains how to set the units for your
application. Sections 3.2.1 and 3.2.2 provide some
preliminary information to help you with the
installation.
Prior to installation, review the
specifications of all the devices in
your system to ensure compatibility
with the User Programmable CAP.
3.2.1 AC P
OWER
AC Power is supplied to the unit by a 115-VAC
wallmounted power supply. A 220-VAC power
supply is also available.
Do not power on the unit until all
switch and jumper selections are
complete.
3.2.2 C
R
ABLE
EQUIREMENTS
Both ports of the unit are configured as DTE. A
special crossover cable is necessary to make one
port DCE. If you require both ports to be
configured as DCE, you will need two crossover
cables.
The EIA RS-232 cable that connects to either of the
unit's two ports must be terminated with a male
DB9 connector. Table 3-1 shows all the pins on the
RS-232 interface which are supported by the User
Programmable CAP.
CHAPTER 3: Installation
NOTE
NOTE
7
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