3.1 SETTING THE DCE/DTE SWITCH
For your convenience, the Model 1000 has an externally accessible
DCE/DTE switch (see diagram below). If the device connected to the
Model 1000 is a modem or multiplexer (or is wired like one), set the
switch to "DTE". This setting causes the Model 1000 to behave like
Data Terminal Equipment and transmit data on pin 2.
If the device connected to the Model 1000 is a PC, terminal or host
computer (or is wired like one), set the switch to "DCE". This setting
causes the Model 1000 to behave like Data Communications
Equipment and transmit data on pin 3
(Default Setting is “DCE”).
5
1
2
3
4
5
6
7
8
1
2
3
4
5
6
Figure 3.
Pin Number Assignments for RJ11 and RJ45 Modular Jacks
RJ-11 Jack
RJ-45 Jack
6
4.0 INSTALLATION
Once you have properly configured the DTE/DCE switch, you are
ready to connect the Model 1000 to your system. This section tells you
how to properly connect the Model 1000 to the twisted pair and RS-232
interfaces, and how to operate the Model 1000.
4.1 CONNECTION TO THE TWISTED PAIR INTERFACE
The Model 1000 supports data-only communication between two
RS-232 devices at distances to 17 miles (27.2 km) and data rates to
19.2 Kbps. There are two essential requirements for installation:
1. These units work in pairs. Therefore, you must have one Model
1000 at each end of a two twisted pair interface.
2. To function properly, the Model 1000 needs two twisted pair of
metallic wire. The pairs must be unconditioned, dry metallic wire,
between 19 and 26 AWG (.4mm to .9mm) (the higher number
gauges may limit distance). Standard dial-up telephone circuits, or
leased circuits that run through signal equalization equipment are
not acceptable.
For your convenience, the Model 1000 is available with three
different 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 1000's twisted pair
interface are pre-wired for a standard TELCO wiring environment (see
Figure 3). The table on the following page shows the signal/pin
relationships.
