3.1 SETTING THE DCE/DTE SWITCH
For your convenience, the Model 2085 has an externally
accessible DCE/DTE switch. If the device connected to the Model
2085 is a modem or multiplexer (or is wired like one), set the switch to
“DTE”. This setting causes the Model 2085 to behave like Data
Terminal Equipment and transmit data on pin 2. If the device
connected to the Model 2085 is a PC, terminal or host computer (or is
wired like one), set the switch to “DCE”. This setting causes the Model
2085 to behave like Data Communications Equipment and transmit
data on pin 3.
3.2 DIP SWITCH CONFIGURATION
The eight switches on switch set S1 (see Figure 3, above)
configure the Model 2085 for echo mode, carrier control method,
RTS/CTS delay, “transmit off” impedance, receive impedance, and 2-
wire/4-wire operation. These switches are located
internally
on the
Model 2085's PC board. To access switch set S1, use a small flat
blade screwdriver to pop open the Model 2085's case as shown in
Figure 4, below.
5
Figure 4.
Opening the Model 2085's plastic case with a small screwdriver
Figure 3.
Close-up of DIP switch showing “ON” and “OFF” positions
1
2
3
4
5
6
7
8
ON
OFF
ON
6. If there is a shield around the telephone cable, it may be
connected to "G" on the terminal block. We recommend connecting the
shield at the computer end only to avoid ground loops. A ground wire is
not necessary
for proper operation of the Model 2085.
7. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
8. Place the 2 halves of the strain relief assembly on either side of
the telephone wire and press together very lightly. Slide the assembly
so that it is about 2 inches from the terminal posts and press together
firmly. If your cable diameter is too small or too large for our strain
relief, please contact our technical support. We have strain relief
assemblies to accommodate most cable diameters.
(continued)
+R
CV- G
-XM
T+
+RCV- G -XM
T+
12
