Patton electronic 1004S Host First Slave Second Slave, Daisy Chain Topology, Operating the Model

Figure 4 shows how to wire the two-pair cables properly for a Model 1004 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. Star wiring for Model 1004 host and slaves

4.2.2 DAISY CHAIN TOPOLOGY

Using a daisy chain topology, you may connect several Model 1004s 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 Technical Support for specific distance estimates.

Figure 5 shows how to wire the two-pair cables properly for a Model 1004 daisy chain topology. Note that the ground connection is not needed.

HOST	FIRST SLAVE	OTHER SLAVE(S)
XMT+	---------------------RCV+-----------------------	RCV+
XMT-	--------------------RCV- -----------------------	RCV-
RCV+	---------------------XMT+-----------------------	XMT+
RCV-	--------------------XMT- -----------------------	XMT-

Figure 5. Daisy chain wiring for Model 1004 host and slaves

Optional Connection: Dual Modular Jacks

To facilitate daisy chaining, the Model 1004 is available in a “DRJ11” (dual RJ-11) or “DRJ45” (dual RJ-45) version. These units have two specially wired modular jacks for twisted pair connection.

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With the dual modular units, you won't need to build cumbersome “Y” cables for your daisy chain application. Simply use a crossover cable to go between the host and the first slave (see Section 4.1.2 for crossover cable wiring instructions), and straight through cables between the slaves.

4.3 CONNECTION TO THE RS-232 INTERFACE

Once you have properly configured the Model 1004 and connect- ed the twisted pair wires correctly, simply plug the Model 1004 directly into the DB-25 port of the RS-232 device. Remember to insert and tighten the two captive connector screws.

(Note: If you must use a cable to connect the Model 1004 to the RS-232 device, make sure it is a straight through cable of the shortest possible length—we recommend 6 feet or less).

4.4 OPERATING THE MODEL 1004

Once the Model 1004 is properly installed, it should operate trans- parently—as if it were a standard cable connection. Operating power is derived from the RS-232 data and control signals; there is no “ON/OFF” switch. All data signals from the RS-232 and RS-485 inter- faces are passed straight through. Additionally, one hardware flow control signal is passed in each direction.

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