QEI ePAQ-9400, Руководство пользователя

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ePAQ-9400 UG-1083
O-
9100 User’s Guide UG-1062
10

Communications Ports Copyright © 2016 QEI.
6 RXD
7 -
8 CTS
The Push-to-Talk (PTT) signal can be used to key an external radio, if needed. This
pin is in the form of an open collector output.
7.3 Port 3 (J5) : Fiber Optic
This generic fiber optic serial communications port has one transmitter (TX) and one
receiver (RX). It supports multimode fiber using ST connectors. A wide variety of
communications bit rates can be supported.
R
T
Tx Rx
(J5)
COMM.
PORT 3
J5 ST Jacks Signal Name
TX Transmit data
output.
RX Received data
input.
7.4 Port 4 (TB5): RS485
This port is a standard 2 wire RS-485, and conforms to the RS-485 specification. It
uses surge suppression circuitry to clamp any input voltage transient and noise to
chassis ground.
The port is capable of supporting multiple devices over a single twisted pair of wires.
A 3-terminal plug-in terminal block is used for connections to external communication
equipment.