Patton electronic 1050patton user manual Setting the DCE/DTE Switch, Installation

3.2 SETTING THE DCE/DTE SWITCH

Correct setting of the DCE/DTE switch eliminates the need for RS- 232 crossover cables. If the RS-232 device you are connecting to the Model 1050 is a PC, terminal or host, or is wired like one, set the DCE/DTE switch to "DCE". If the RS-232 device you are connecting to the Model 1050 is a modem or multiplexer, or is wired like one, set the DCE/DTE switch to "DTE".

3.3 SETTING THE CARRIER CONTROL STRAP (see Note 2)

The setting of the carrier control strap determines whether carrier is “constantly on” or “controlled by RTS”. For “controlled by RTS” position the strap on pegs 1 & 2. For “constantly on” position the strap on pegs 2 & 3. Figure 2 (below) shows the two possible settings of the carrier control strap.

1 2 3 1 2 3 1 2 3

Figure 2 Model 1050 strap settings

NOTE 1: If you are connecting twisted pair to the Model 1050 using the internal terminal blocks, make the twisted pair connection before re-inserting the PC board into the case. See Section 4.1.1 for details on twisted pair connection.

NOTE 2: If you are using the Model 1050 in a multipoint application, consult Section 4.2 for proper Master and Slave carrier control settings.

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4.0 INSTALLATION

The Model 1050 is easy to install. After configuring the unit properly, you will need to connect the two twisted pairs and the RS-232 cable. Figure 2 (below) shows the rear panel location of the RJ-11 jack and strain relief grommet (line connections), as well as the female DB- 25 (RS-232 connection).

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Range Modem

Power RS-232 Interface Line

Figure 3. Rear view of 1050 showing interface connectors

4.1 TWISTED PAIR WIRING OVERVIEW

These short range modems are designed to work in pairs. You will need one at each end of a 4-wire twisted pair circuit. The pairs must be "dry" (unconditioned) metallic wire, 19 - 26 AWG. The smaller gauges limit distance somewhat compared with larger gauges. When you have completed wiring for your data circuit, the pin connections should be as shown below:

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

4.1.1 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS

The Model 1050 terminal block is located on the PC board inside the unit. To access the PC board, remove the two screws on the back panel and slide the PC board out of the case. Connect the bare twisted pair wires by first inserting them through the grommet on the back panel, then stripping the ends and connecting the individual leads to the terminal block. Be sure the end-to-end connections follow the diagram above.

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