AnyDATA EMII-800 User Manual - Page 14

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Interface Description

4. Interface Descriptions

4.1 Overview

This chapter covers information required to design the EMII-800 into a subscriber unit application.

In addition, the internal signals that are necessary for complete understanding of the UART interfaces are

described below.

4.2 RS232 Interface (Standard)

The Universal Asynchronous Receiver Transmitter (UART) communicates with serial data that

conforms the RS-232 Interface protocol. The modem provides 3.0V CMOS level outputs and 3.0V

CMOS switching input level. And all inputs have 5.0V tolerance but 3.0V or 3.3VCMOS logic

compatible signals are highly recommended.

All the control signals of the RS-232 signals are active low, but data signals of RXD, and TXD Are

active high. The UART has a 64byte transmit (TX) FIFO and a 64byte receive (RX) FIFO. The UART

Features hardware handshaking, programmable data sizes, programmable stop bits, and odd, even, no

parity. The UART operates at a 115.2kbps maximum bit rate.

NAME

DP_DCD/

DP_RI/

DP_RTS/

DP_TXD

DP_DTR/

DP_RXD

DP_CTS/

GND

EMII-800 V1.0

EMII-800 Reference Manual Application Information

DESCRIPTION

Data Carrier Detect

Ring Indicator

Request to Send

Transmit Data

Data Terminal Ready

Receive Data

Clear to Send

Signal Ground

Figure 4-1 UART Interface Pinouts

AnyDATA.NET Proprietary

CHARACTERISTIC

Network connected from the modem

Output to host indicating coming call

Ready for receive from host

Output data from the modem

Host ready signal

Input data to the modem

Modem output signal

Signal ground

Use Subject to Restrictions