OP7100
38
s
Hardware
RX
TX
GND
RTS
CTS
DTR
RX
TX
GND
RTS
CTS
Modem
Side
OP7100
Side
Figure 3-17. 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 Z180s 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 Z180s 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 3-17 shows the wiring for
connections between a modem and
the OP7100.
Summary of Contents for OP7100
Page 1: ...OP7100 Serial Graphic Display User s Manual 019 0065 020418 J ...
Page 10: ...OP7100 x s About This Manual ...
Page 16: ...OP7100 16 s Overview ...
Page 50: ...OP7100 50 s Hardware ...
Page 72: ...OP7100 72 s Software ...
Page 80: ...OP7100 80 s Graphics Programming ...
Page 86: ...OP7100 86 s Installation ...
Page 96: ...OP7100 96 s Specifications ...
Page 110: ...110 s Serial Interface Board 2 OP7100 ...
Page 111: ...OP7100 Backup Battery s 111 APPENDIX E BACKUP BATTERY ...
Page 114: ...OP7100 114 s Backup Battery ...
Page 122: ...OP7100 122 s Index ...