Patton electronic 1012B user manual Optional Connection Dual Modular Jacks

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AT&T standard modular pin assignments

4.2 WIRING FOR MULTI-POINT CIRCUITS

The Model 1012B supports multi-point applications using either a star or a daisy chain topology. Both topologies require special wiring.

Note: Refer to Section 3.2 for multi-point settings.

4.2.1 STAR TOPOLOGY

Using a star topology, you may connect several Model 1012Bs together in a master/slave arrangement. Maximum distance between the units will vary based upon the number of drops, data rate, wire gauge, etc. Contact Patton Technical Support (301) 975-1007; http://www.patton.com; or, support@patton.com for specific distance estimates.

Table 3 shows how to wire the two-pair cables properly for a Model 1012B 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-

Table 3. Star wiring for Model 1012B host and slaves

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4.2.2 DAISY CHAIN TOPOLOGY

Using a daisy chain topology, you may connect several Model 1012Bs together in a master/slave arrangement. Maximum distance between the units will vary based upon the number of drops, data rate, wire gauge, etc. Contact Patton Technical Support at (301) 975-1007; http://www.patton.com; or, support@patton.com for specific distance estimates.

Figure 6 shows how to wire the two-pair cables properly for a

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

Table 3. Daisy Chain Wiring for Model 1012B Host and Slaves

Model 1012B’s daisy chain topology. Note that the ground connection is not needed.

Optional Connection: Dual Modular Jacks

To facilitate daisy chaining, the Model 1012B 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. With the dual modular units, you do not 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.

4.3CONNECTION TO THE RS-232 INTERFACE

Once you have properly configured the Model 1012B and

connected the twisted pair wires correctly, plug the Model 1012B directly into the DB-25 port of the RS-232 device. After doing so, remember to insert and tighten the two captive connector screws.

Note: If you must use a cable to connect the Model 1012B to the RS-232 device, make sure it is a straight through cable of the shortest possible length—we recommend 6 feet (1.8 meters) or less.

4.4 OPERATING THE MODEL 1012B

Once the Model 1012B is properly installed, it should operate transparently—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 interface are passed straight through. Additionally, one control signal is passed in each direction.

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