OP7100
38 Hardware
J8
GND
CTS/RX1
R
TS/TX1
RX0
GND
R
TS/TX1
CTS/RX1
J10
TX0
1
2
3
4
5
6
7
8
9
10
2 4 6 8
1 3 5 7 9
RS-232 Communication
Figure 3-17 shows the RS-232 signals on header J8 and header J10 (the
DE-9 connector).
Figure 3-17. RS-232 Signals
Pin 9 on header J10, the DE-9 connector, may be configured to
carry DCIN, the input voltage, by adding a 0
Ω
resistor at R32.
Be careful when connecting other devices to header J10 when
R32 is installed since not all devices can handle DCIN. For
example, PCs are limited to 12 V.
The availability of DCIN on pin 9 of header J7 allows a DC
power supply to be made available to the device being
connected to the OP7100.
Rabbit Semiconductor has RS-232 support libraries for Z180 Ports 0 and
1. The following functional support for serial communication is included.
•
Initializing the serial ports.
•
Monitoring and reading a circular receive buffer.
•
Monitoring and writing to a circular transmit buffer.
•
CTS (clear to send) and RTS (request to send) control for Z180 Port 0.
Receive and Transmit Buffers
Serial communication is easier with a background interrupt routine that
updates receive and transmit buffers. Every time a port receives a charac-
ter, the interrupt routine places it into the receive buffer. A program can
read the data one character at a time or as a string of characters terminated
by a special character.
Summary of Contents for OP7100
Page 1: ...OP7100 Serial Graphic Display User s Manual 019 0065 070831 O ...
Page 10: ...OP7100 x About This Manual ...
Page 16: ...OP7100 16 Overview ...
Page 74: ...OP7100 74 Software ...
Page 82: ...OP7100 82 Graphics Programming ...
Page 88: ...OP7100 88 Installation ...
Page 98: ...OP7100 98 Specifications ...
Page 108: ...OP7100 108 Memory I O Map and Interrupt Vectors ...
Page 112: ...112 Serial Interface Board 2 OP7100 ...
Page 113: ...OP7100 Backup Battery 113 APPENDIX E BACKUP BATTERY ...
Page 116: ...OP7100 116 Backup Battery ...
Page 124: ...OP7100 124 Index ...
Page 126: ...XX0000 Schematics ...