Patton electronic 1004S user manual Twisted Pair Connection Using Terminal Blocks

4.0 INSTALLATION

Once the Model 1004 is properly configured, it is ready to connect to your system. This section tells you how to properly connect the Model 1004 to the twisted pair and RS-232 interfaces, and how to operate the Model 1004.

4.1 TWISTED PAIR CONNECTION

The Model 1004 supports data-only communication between two RS-232 devices at distances to 9.4 miles and data rates to 115.2 Kbps. There are two essential requirements for installing the Model 1004:

1.These units work in pairs. Therefore, you must have one Model 1004 at each end of a two twisted pair interface. In multipoint environments, there must be one Model 1004 at the RS-232 host and one at each RS-232 terminal.

2.To function properly, the Model 1004 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). Standard dial-up telephone circuits, or leased cir- cuits that run through signal equalization equipment, are not acceptable.

For your convenience, the Model 1004 is available with several different twisted pair interfaces: RJ-11 jack, RJ-45 jack, terminal blocks with strain relief and dual modular jacks (for multipoint daisy- chaining).

4.1.1 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS

If your application requires you to connect one or two pairs of bare wires to the Model 1004, you will need to open the case to access the terminal blocks. The following instructions will tell you how to open the case, connect the bare wires to the terminal blocks and fasten the strain relief collar in place so the wires won't pull loose.

1.You should already have the case open for the configuration procedure. If not, see Section 3.2.

2.Strip the outer insulation from the twisted pair(s) about one inch from the end.

3. Strip the insulation on each of the twisted pair wires about .25”.

4.In a two pair circuit, connect one pair of wires to XMT+ and XMT- (transmit positive and negative) on the terminal block, making careful note of which color is positive and which color is negative.

5.Connect the other pair of wires to RCV+ and RCV- (receive positive and negative) on the terminal block, again making careful note of which color is positive and which color is negative.

Ultimately, you will want to construct a two pair crossover cable that makes a connection with the two Model 1004s as shown below.

XMT+	--------------------------------------------------	RCV+	} One Pair
XMT-	--------------------------------------------------	RCV-
G ----------------------	To Shield (Optional)	G	} One Pair
RCV+--------------------------------------------------		XMT+
RCV- --------------------------------------------------		XMT-

6.In a single pair circuit, use only the transmit (XMT) pair as

XMT+--------------------------------------------------	XMT+
XMT- --------------------------------------------------	XMT-
shown below:

7.If there is a shield around the telephone cable, it may be con- nected to “G” on the terminal block. To avoid ground loops, we recom- mend connecting the shield at the computer end only. A ground wire is not necessary for proper operation of the Model 1004.

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