XE1212C Ver la hoja de datos (PDF) - Xecom
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XE1212C Datasheet PDF : 16 Pages
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Modem Diagnostics
Analog Loopback
Before entering analog loopback, the telephone line
must be disconnected. Normal telephone line signals
may affect the results of the analog loopback test. The
test is started by entering the following command,
AT&T1<CR>. A CONNECT result code will be
displayed. All subsequent characters typed on the
keyboard are displayed on the screen. The test may be
ended by the escape command. Register S18
determines the length of the test.
Analog Loopback may also be run using the modem's
internal test pattern. The command AT&T8<CR>
initiates the analog loopback with self-test. The test
pattern is looped from the transmitter to the recevier and
checked for errors. The number of errors is reported
when the test terminates.
Digital Loopback
This test causes the modem to automatically resend
each received character. It is used for testing a remote
modem. The modems must be connected before the
test. The test is started with the commands:
AT&T3<CR>. All the characters received from the
remote modem are looped back to it through the
XE1212C and are not displayed on the local screen.
Remote Digital Loopback
This test enables the remote modem to loop received
data back to the transmitting modem. To execute the
test, the remote modem must be capable of operating in
remote digital loopback. The test is started by the
command: AT&T6<CR>. During this test, data
transmitted by the XE1212C will be looped back by the
remote modem. The Remote Digital Loopback will
utilize the XE1212C internal test pattern if the test is
intiated with the command AT&T7<CR>.
Interrupt Control Functions
Interrupt
Identification
Register
Interrupt Set and Reset Functions
B1 B1 B0
001
110
Priority Level
Highest
100
010
Second
Third
00 0
Fourth
Interrupt Flag
None
Receiver Line
Status
Receiver Data
Available
Transmitter
Holding Register
Empty
Modem Status
Interrupt Source
None
Overrun Error or
Parity Error or
Framing Error
Receiver Data
Available
Transmitter
Holding Register
Empty
Ring Indicator or
or RLSD
Interrupt Reset
Reading LSR
Reading the
RBR
Reading the IRR
(if source of interrupt)
or Writing toTHR
Reading the Modem
Status Register
XECOM
(12)
XE1212C
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