CHAPTER 8. SERIAL CONTROLLER
This chapter discusses operation of the two ZT 8905 serial ports. Each channel is compatible with
the industry standard 16550 serial port, including support for a 16 byte FIFO for read and write
operations.
ZT 8905 SPECIFICS
The ZT 8905 includes two serial ports that are compatible with the industry standard 16550. The
drivers for each serial port are implemented with 5 V charge pump technology to eliminate the need
for a ±12 V supply. The serial ports include a complete set of handshaking and modem control
signals, maskable interrupt generation, and data transfer rates up to 115.2 Kbaud. Both channels are
supplied as DTE configured devices through the multi-I/O connector, J5. The ZT 90205 cable
assembly allows each channel to be interfaced directly to 9-pin D-Shell serial devices, as used in PC
applications. Each port may be disabled to allow for STD 32 based COM ports (for example, an off-
board modem) to be used.
The major features of each serial port are listed below.
•
Two RS-232 channels
•
16550 compatible
•
Drivers do not require ±12 V
•
Baud rates up to 115.2 Kbaud
•
Polled and interrupt operation
•
Loopback diagnostics
Details for the two serial ports on the ZT 8905 are discussed in the following topics.
Address Mapping
The address mapping for the PC standard architecture and the ZT 8905 is shown below.
Serial Channel
PC Port Address
ZT 8905 Port Address
COM1
3F8-3FF
3F8-3FF or disabled for off-board COM support
COM2
2F8-2FF
2F8-2FF or disabled for off-board COM support
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Содержание ZT 8905
Страница 13: ...Contents Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...
Страница 15: ...Tables Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...
Страница 163: ...Index xxxvi Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...
Страница 164: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...