3.0 CONFIGURATION
The Model 1110 is simple to install and is ruggedly designed for
excellent reliability: just set it and forget it. This section will describe
how to configure the Model 1110’s DCE/DTE switch and how to set the
internal DIP switches.
3.1 SETTING THE EXTERNAL DCE/DTE SWITCH
For your convenience, the Model 1110 has an externally
accessible DCE/DTE switch (see Figure 1, below). If the device
connected to the Model 1110 is a PC, terminal or host computer (or is
wired like one), set the switch to “DCE”. This causes the Model 1110 to
behave like Data Communications Equipment and transmit data on pin
3. If the device connected to the Model 1110 is a modem or multiplexer
(or is wired like one), set the switch to “DTE”. This setting causes the
Model 1110 to behave like Data Terminal Equipment and transmit data
on pin 2.
3.2 SETTING INTERNAL DIP SWITCHES
The Model 1110‘s eight external DIP switches allow configuration
of flow control and LED options. To set the internal switches, follow
these steps:
1) Open the Model 1110 case by inserting a small flat-blade
screwdriver between the case lip and DB-25 connector and
twisting gently (see figure 2, opposite page).
2) Having exposed the Model 1110 PC board, you will see the
miniature DIP switch packet on the underside of the board (the
side opposite the DCE/DTE switch).
3) To set the switches, use a small screwdriver and gently push
each switch to its proper setting. The ON position is printed on the
switch packet.
4) Fit the case halves together and push to snap closed.
3.2.1 DETAILED SWITCH SETTINGS
The DIP switches on the Model 1110 PC board are labeled 1-8.
Only switches 1-4 are used. Switches 5-8 are reserved for future use.
Below are descriptions of the Model 1110 DIP switch settings.
Switch 1: Carrier Control
The setting for Switch 1 determines whether carrier is constantly
on or controlled by RTS
*Factory Default
(continued)
Figure 2. Using a small screwdriver to open the Model 1110 case
Figure 1 Externally accessible DCE/DTE switch
DCE
DTE
DCE
DTE
3
4
Carrier
SW1
Constant
OFF*
Controlled by RTS
ON