參數(shù)資料
型號: 20-101-0732
廠商: Rabbit Semiconductor
文件頁數(shù): 60/126頁
文件大?。?/td> 0K
描述: INTERFACE SMART SCREEN OP7100
標準包裝: 1
系列: SBC
模塊/板類型: 單板計算機模塊
適用于相關(guān)產(chǎn)品: OP7100
其它名稱: 20-101-732
20-101-732-ND
OP7100
Hardware
39
RX
TX
GND
RTS
CTS
DTR
RX
TX
GND
RTS
CTS
Modem
Side
OP7100
Side
Figure 3-18. Connections Between
Controller and Modem
A program sends data by writing characters into the transmit buffer. If the
serial port is not already transmitting, the write functions will automatically
initiate transmission. Once the last character of the buffer is sent, the
transmit interrupt is turned off. A high-level application can write data one
character at a time or in a string.
CTS/RTS Control
The Z180’s hardware constrains its Port 0 to have the CTS (clear to send)
pulled low by the RS-232 device to which it is talking. The OP7100 does
not support CTS for the Z180’s Port 1.
Modem Communication
Modems and telephone lines facilitate RS-232 communication across great
distances.
The Dynamic C RS-232 library supports communication with a Hayes Smart
Modem or compatible. The CTS, RTS and DTR lines of the modem are not
used. If the modem used is not truly Hayes Smart Modem compatible, tie the
CTS, RTS and DTR lines on the mo-
dem side together. The CTS and RTS
lines on the controller also have to
be tied together. A “NULL-modem”
cable is also required for the TX and
RX lines. A commercial NULL-mo-
dem cable would have its CTS and
RTS lines tied together already on
both sides.
Figure 3-18 shows the wiring for
connections between a modem and
the OP7100.
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