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Figure 1. Model 1012B Board, showing switch and strap locations
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To change the DTE/DCE setting, do the following:
1. Using a small screwdriver, insert the tip into one of the slots in
the side of the Model 1012B (see Figure 2).
2. Rotate the screwdriver as shown in Figure 2 to open the case.
3. If the device connected to the Model 1012B is a PC, terminal
or host computer (or is wired like one), set switch SW1 to “DCE” (see
Figure 3). This causes the Model 1012B to behave like data
communications equipment.
4. If the device connected to the Model 1012B is a modem or
multiplexer (or is wired like one), set the switch to “DTE.” This setting
causes the Model 1012B to behave like data terminal equipment.
5. After you finish configuring the DTE/DCE switch, snap the
case halves back together, then go to section 4.0, “Installation.”
Figure 2. Using a small screwdriver to open the Model 1012B case
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Figure 3. SW1 DTE/DCE switch
DCE
DTE
3.0 CONFIGURATION
By default, the Model 1012B is configured to be a DCE with the
transmitter set for controlled carrier. If the 1012B is in controlled carrier
mode for multi-point operation, the transmitter is controlled by RTS (pin 4)
when it is a DCE, and controlled by CD (pin 8) when configured as a DTE.
The DTE/DCE slide switch (SW1 in Figure 1) is used to configure
DTE or DCE orientation. The RTS/CD control jumper (J2 in Figure 1) is
used to configure constant/controlled carrier mode.
Section 3.1 describes how to configure the DTE/DCE switch.
Section 3.2 provides information on configuring the transmitter to be
constant
or
controlled.
3.1 SETTING THE MODEL 1012B AS DCE OR DTE
Note: Remember that when the DTE/DCE switch is set for DCE,
the 1012B functions as a DCE device. Otherwise, when the switch is in
the DTE position, the short range modem operates as a DTE device..
SW1 (located inside the Model 1012B) controls the DTE/DCE
configuration of the Model 1012B. Figure 1 shows the location of the
DTE/DCE switch on the 1012B circuit board.