Patton electronic 2085 2 4-WIRE Connection Using RJ-11 or RJ-45, RJ-11 Signal, RJ-45 Signal

4.0 INSTALLATION

Once you have properly set the configuration switches, you are ready to connect the Model 2085 to your system. This section tells you how to properly connect the Model 2085 to the RS-485 and RS-232 interfaces, and how to operate the Model 2085.

4.1.2 4-WIRE CONNECTION USING RJ-11 OR RJ-45

The RJ-11 and RJ-45 connectors on the Model 2085's RS-485 side are pre-wired for a standard TELCO wiring environment. The signal/pin relationships are shown below:

4.1 CONNECTION TO THE RS-485 INTERFACE

To function properly, the Model 2085 must have one or two twisted pairs of metallic wire. These pairs must be "dry" (unconditioned) metallic wire, between 19 and 26 AWG (the higher number gauges may limit distance somewhat).

For your convenience, the Model 2085 is available with several different physical interfaces on the RS-485 side: DB-25 (following the RS-520 standard), RJ-11 jack, RJ-45 jack, and terminal blocks with strain relief.

4.1.1 4-WIRE CONNECTION USING THE DB-25

The DB-25 connector on the Model 2085's RS-485 side conforms to the RS-530 interface standard. When connecting to an RS-485 device that also conforms to the RS-530 standard, your cable should be "crossed over" in the manner shown below:

RJ-11 SIGNAL

1...................GND*

2...................RCV-

3...................XMT+

4...................XMT-

5...................RCV+

6...................GND

*Connection to ground is optional

1

2

3

4

5

6

RJ-45 SIGNAL

1.................N/C

2.................GND*

3.................RCV-

4.................XMT+

5.................XMT-

6.................RCV+

7.................GND

8.................N/C

1

2

3

4

5

6

7

8

MODEL 2085		RS-485 (530) DEVICE
SIGNAL	DB-25 PIN	DB-25 PIN	SIGNAL
XMT+	2	3	RCV+
XMT-	14	16	RCV-
RCV+	3	2	XMT+
RCV-	16	14	XMT-

NOTE: It is not necessary that the RS-485 device adhere to the RS-530 standard. However, you must make sure that the signals, polarities, and pairing of your connection conform to the above diagram.

In most modular RS-485 applications it is necessary to use a "cross over" cable. The diagram below shows how a cross over cable should be constructed for an environment where both the Model 2085 and the RS-485 device use a 6-wire RJ-11 connector. Similar logic should be followed when using RJ-45 connectors or a combination of the two.

MODEL 2085		RS-485 DEVICE
SIGNAL	PIN#	PIN#	RS-422 SIGNAL
GND†	1 -------------------	N/C
RCV-	2 -------------------	4	XMT-
XMT+	3 -------------------	5	RCV+
XMT-	4 -------------------	2	RCV-
RCV+	5 -------------------	3	XMT+
GND†	6 -------------------	N/C

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