Star Topology, RS-232 Connection | Patton electronic 1050patton

4.2.2 STAR TOPOLOGY

Using a star topology, you may connect several Model 1050s together in a master/slave arrangement. Maximum distance between the units will vary based upon the number of drops, data rate, wire gauge, etc. Call Patton Technical Support for specific distance estimates.

Figure 4 (below) shows how to wire the two-pair cables properly for a Model 1050 star topology. Note that the ground connection is not needed.

HOST

FIRST SLAVE

SECOND SLAVE

XMT+RCV+

RCV+

XMT-RCV-

RCV-

RCV+XMT+

XMT+

RCV-XMT-

XMT-

Figure 4. Model 1060 star wiring

In a multipoint topology, you must configure the master Model 1050's carrier control strap differently than those of the slave Model 1050(s). Here are the proper carrier control strap settings for a star topology:

Function	Carrier Control Strap Setting
Master	Carrier “Constantly ON” (pegs 2 & 3)
Slave(s)	Carrier “Controlled by RTS” (pegs 1 & 2)

4.3 RS-232 CONNECTION

To connect the Model 1050 to a piece of data terminal or data communications hardware, use a straight through RS-232 cable. Plug the cable directly into the DB-25 port on the rear of the Model 1050. The DCE/DTE switches eliminate the need for a crossover cable.

5.0 OPERATION

Once you have configured each Model 1050 properly and

connected it, simply plug in the AC power adapter to get it running; there is no power switch on the Model 1050. You can monitor the operation of the Model 1050 using the front panel LED indicators and built-in loopback test modes.

5.1 LED INDICATORS

The Model 1050 incorporates three front panel LEDs that show the status of the modem:

1.The loopback test LED glows when the loopback test switch has been depressed and is in a test mode.

2.The tri-state TD and RD indicators blink red and green with data activity. Solid red indicates a low RS-232 logic level. Note: RS-232 devices idle in a low state, so the LED will glow red if the connections are correct and the RS-232 device is in an idle state.

5.2LOOPBACK TEST MODES

Select the test modes by depressing the "Loopback Test" switch.

When in loopback mode, the "Loopback Test" LED will glow red. Two tests are possible using this switch: Local Analog Loop (LAL), and Remote Analog Loop (RAL).

5.2.1 LOCAL ANALOG LOOP

The first test mode is Local Analog Loop (V.54 Loop 3). Any data sent to the local Model 1050 in this mode will be echoed (returned) back to the user device. For example, characters typed on the keyboard of a terminal will appear on the terminal screen (see Figure 3 on the following page).

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