Patton electronic 1025S Connection to the Twisted Pair Interface, Signal PIN# Color

4.0 INSTALLATION

Once the Model 1025 is properly configured, it is ready to connect to your system. This section tells you how to properly connect the Model 1025 to the twisted pair and RS-232 interfaces, and how to operate the Model 1025.

4.1 CONNECTION TO THE TWISTED PAIR INTERFACE

The Model 1025 supports data-only communication between two RS-232 devices at distances to 11 miles and data rates to 19.2 Kbps. There are two essential requirements for installing the Model 1025:

1.These units work in pairs. Therefore, you must have one Model 1025 at each end of a two twisted pair interface.

2.To function properly, the Model 1025 needs two twisted pairs of metallic wire. These pairs must be unconditioned, dry metallic wire, between 19 and 26 AWG (the higher number gauges may limit distance somewhat). Standard dial-up telephone circuits, or leased circuits that run through signal equalization equipment, are not acceptable.

For your convenience, the Model 1025 is available with three dif- ferent twisted pair interfaces: RJ-11 jack, RJ-45 jack and terminal blocks with strain relief.

4.1.1 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45

The RJ-11 and RJ-45 connectors on the Model 1025’s twisted pair interface are pre-wired for a standard TELCO wiring environment. The signal/pin relationships are shown below:

RJ-11	SIGNAL	RJ-45	SIGNAL
1	GND†	1	N/C
2	RCV‡	2	GND†
3	XMT	3	RCV‡
4	XMT	4	XMT
5	RCV	5	XMT
6	GND	6	RCV
		7	GND
		8	N/C

†Connection to ground is optional

‡The Model 1025 is not polarity sensitive

When connecting two Model 1025s, it is necessary to use a “crossover” cable. The diagram below shows how a crossover cable should be constructed for an environment where both Model 1025s use a 6-wire RJ-11 connector. Similar logic should be followed when using RJ-45 connectors or a combination of the two.

SIGNAL	PIN#	COLOR	COLOR	PIN#	SIGNAL
GND†	1	Blue‡	White	6	GND
RCV◊	2	Yellow	Red	4	XMT
XMT	3	Green	Black	5	RCV
XMT	4	Red	Yellow	2	RCV
RCV	5	Black	Green	3	XMT
GND	6	White	Blue	1	GND

†Connection to ground is optional

‡Standard color codes—yours may be different ◊ The Model 1025 is not sensitive to polarity

		1	- Blue
1	- Blue	2	- Orange
2	- Yellow	3	- Black
3	- Green	4	- Red
4	- Red	5	- Green
5	- Black	6	- Yellow
6	- White	7	- Brown
		8	- Slate

Standard AT&T color codes

4.1.2 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS

If your application requires you to connect two pairs of bare wires to the Model 1025, you will need to open the case to access the termi- nal blocks. The instructions on the following pages will tell you how to open the case, connect the bare wires to the terminal blocks, and fas- ten the strain relief collar in place so that the wires won’t pull loose.

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