Digi XStream-PKG-R RS-422 Guía de usuario descargar pdf (Pagina 10)

9XTend™ RS-232/422/485 RF Modem User’s Guide

2.2. RS-485 (2-wire) Operation

2.2.1. DIP Switch Settings and Pin Signals

Note: Refer to Figure 2-15 and Figure 2-16 for the RJ-45 connector pin designations used in

RS-485/422 environments.

2.2.2. Wiring Diagram

Figure 2-09. XTend RF Modem in an RS-485 (2-wire) half-duplex environment

Table 2-02. RS-485 (2-wire half-duplex) signals and their implementations on the XTend RF Modem

DB-9 Pin RS-485 Name Description Implementation

2 T/R- (TRA) Negative Data Line Transmit serial data to and from the RF modem

5 GND Ground Signal Ground

8 T/R+ (TRB) Positive Data Line Transmit serial data to and from the RF modem

9PWR Power

Optional power input that is connected internally

to the front power connector

1, 3, 4, 6, 7 not used

Figure 2-06.

RS-485 (2-wire) Half-duplex

DIP Switch Settings

Figure 2-07.

Pins used on the female RS-232 (DB-9)

Serial Connector

Figure 2-08.

RS-485 (2-wire) w/ Termination (optional)

Termination is the 120 Ω resistor between T+ and T-.

DIP Switch settings are read and applied

only while powering-on.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 68 69

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