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| 型號： | IC_SS |
| 文件頁數(shù)： | 23/36頁 |
| 文件大小： | 480K |
| 代理商： | IC_SS |
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Network Command Examples
(Continued)
TL/DD/11727–17
FIGURE 12. Test Report Structure
Test Mode includes a simple set of applications that use the
services provided by the other IC/SS functions. The embed-
ded Test Mode application in the Master modem exchanges
data with the test mode applications embedded in one or
more Slave modems, and generates a report in either ASClI
or Binary form.
This data exchange is used to measure the performance of
the modems and the conditions on the power line. The em-
bedded Test Mode application keeps statistics on the ex-
change of data with other modems, tracking data integrity
and communications performance (retries, parity errors,
which Slaves responded, tune code used, etc.). This infor-
mation is formatted into a report which is transmitted to the
Master’s Host computer. This is illustrated in Figure 11.
If you have known power line conditions, the test mode in-
formation lets you evaluate the IC/SS modem’s perform-
ance. In a field installation, test mode can be used periodi-
cally by the host computer to evaluate the power line condi-
tions, and perhaps determine whether to perform or defer a
given application operation.
ASClI versus Binary Test Mode
The major differences are that Binary Test Mode does not
automatically generate a reportDyou must use the Control
F command (Get Test Results) to get a reportDand the
report is sent out as 11 bytes of binary information, rather
than being formatted as ASCII hex with space delimiters
and a CR/LF at the end of the report.
Operation of Test Mode
Test Mode works through the normal IC/SS network layer.
This means that all the mechanisms in IC/SS that are used
to get information correctly over the power line are in use
during Test Mode. Gain, Bit Rate and Tune Code will be
adjusted according to the measured Bite error Rate, just as
in all other commands. The Packet Overlay mechanism will
be used to try to make good packets out of damaged ones.
The Test Mode Report
The Test Mode application generates a Test Mode Report
which is either automatically transmitted (via ASCII Test
Mode command) or transmitted on demand (via the Binary
Test Mode and the Get Test Results commands) to the at-
tached Host.
When in ASCII Test Mode, the time between reports can
range from 20 seconds to 4.5 minutes. This time is depen-
dent upon two thingsDthe modem to modem bit rate and
the behavior of the Slaves being tested. The Test Mode
application will generate its report when count of any one of
information categories being tracked threatens to overflow.
Any category getting within 32 (20 hex) of overflow will
cause the test mode report to be generated.
Example: Test mode command
e
k
1B
l k
0B
l k
01
l
k
01
l
(ASCII hex data)
Slave 1 is connected and working. Test Mode will
likely do E0 hex (224 decimal) test cycles (byte 1)
and then generate a test report.
Example: Test mode command
e
k
1B
l k
0B
l k
01
l
k
02
l
(ASCII hex data)
Slave 1 is connected and working, Slave 2 is disconnected.
Test Mode will likely do E0 hex (224 decimal) retries (byte 8)
and 36 hex (54 decimal) test cycles and then generate a
test report.
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