AnyDATA EMII-800 Посібник користувача - Сторінка 14
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Друкувати сторінкуInterface 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