20-101-0732 Rabbit Semiconductor, 20-101-0732 Datasheet - Page 39
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20-101-0732
Manufacturer Part Number
20-101-0732
Description
INTERFACE SMART SCREEN OP7100
Manufacturer
Rabbit Semiconductor
Datasheet
1.101-0303.pdf
(126 pages)
Specifications of 20-101-0732
Module/board Type
Single Board Computer Module
For Use With/related Products
OP7100
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
20-101-732
20-101-732
20-101-732
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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.
OP7100
Figure 3-18. Connections Between
Modem
GND
DTR
Side
RTS
CTS
Controller and Modem
RX
TX
Hardware 39
OP7100
Side
RX
TX
GND
RTS
CTS
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