3.0 CONFIGURATION
The Model 285 is configured using six PC board mounted switch-
es. Figure 1 (below) shows the switch locations, along with the loca-
tion of the terminal blocks and optional surge protectors:
3.1 SETTING THE DTE/DCE SWITCH
For your convenience, the Model 285 has an externally accessi-
ble DTE/DCE switch (see Figure 2, below). If the device connected to
the Model 285 is a modem or multiplexer (or is wired like one), set the
switch to "DTE". This setting causes the Model 285 to behave like
Data Terminal Equipment and transmit data on pin 2.
If the device connected to the Model 285 is a PC, terminal or host
computer (or is wired like one), set the switch to "DCE". This setting
causes the Model 285 to behave like Data Communications Equipment
and transmit data on pin 3.
3
3.2 SETTING CONFIGURATION SWITCHES SW1 AND SW2
The five switches shown in Figure 3 (below) configure the Model
285 for RTS/CTS delay, echo, method of carrier control, impedance,
and 2-wire/4-wire operation. These switches are located
internally on
the Model 285's PC board. To access SW1 and SW2, use a small flat
blade screw driver to pop open the Model 285's case as shown in
Figure 4 (below):
4
DCE
DTE
DCE/DTE
Switch
2-wire/4-wire
Switch
Surge
Suppressors
(285S only)
Terminal
Block
Control
Switches
"ON"
"OFF"
SW2
SW1
Figure 1. Model 285 board, showing switch locations
Figure 2. Close up of external DCE/DTE switch
Figure 3. Close up of switches SW1 and SW2 on the PC board
Figure 4. Opening the Model 285's plastic case with a small screw driver
