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.
9. Insert the strain relief assembly with the wire going through it
into the slot in the bottom half of the modem case and seat it into the
recess in the case. (If the telephone wire is too thin to be held by the
strain relief assembly, you will need to order a different sized strain
relief. Call Patton's Sales Department at (301) 975-1000.)
11
3.1.2 DIP SWITCH S1 SETTINGS
DIP switch S1 is used to configure receive impedance,
2-wire/4-wire operation and “echo” enable/disable. The summary table
below shows the factory default settings for switch S1. Following the
summary table is a detailed description of each individual switch.
*Note:
Switches S1-2 and S1-3 should be switched simultaneously
S1-1: Receive Impedance
The setting for switch S1-1 selects the impedance of the input
receiver. You may select either a “low” impedance of 120 Ohms or a
“high” impedance of 16 kOhms. By selecting the proper impedance for
each drop, there may be up to 50 receivers in one application.
S1-1
Setting
On
Low (120 Ohm)
Off
High (16 kOhm typical)
S1-2 and S1-3: 2-wire/4-wire Modes
Switches S1-2 and S1-3 are set together to determine whether the
Model 2089 is in 2-wire or 4-wire operating mode.
Note:
2-wire mode
is half-duplex only.
S1-2
S1-3
Setting
On
On
2-wire mode
Off
Off
4-wire mode
S1-4: Echo Mode
The setting for switch S1-4 determines whether the Model 2089
echoes data back to the transmitting device (half-duplex mode only).
S1-4
Setting
On
Echo On
Off
Echo Off
6
SWITCH S1 SUMMARY TABLE (factory defaults in bold)
Position
Function
OFF Position
ON Position
S1-1
RCV Impedance
16 kOhm typ.
120 Ohm
S1-2*
2-wire/4-wire
4-wire
2-wire
S1-3*
2-wire/4-wire
4-wire
2-wire
S1-4
Echo Mode
Echo OFF
Echo ON
