Nokia 9000i Service Manual page 211

After Sales
Technical Documentation
If the Mode is set to Input, the target is commanded to wait for the Output
Byte from the tranceiver connected to the service software. If the Output
byte is received in the target, the test is considered successful.
2.6 – Test Serial Ports
This menu provides a test for the serial ports of the PDA. One of two
methods to test one of the two COM ports can be chosen.
The enquired input parameters from the user are:
Mode default:
Port default:
If the Mode is set to Local loop, bytes from FFh to 0h are sent internally in
the target's UART in a specific UART Local loop mode. If the same
characters are received internally, the test is considered to been
successful.
If the Mode is set to External loop, bytes from FFh to 0h are sent via the
chosen COM Port of the target. The test expects the same bytes back via
an external loop connected between RxD–TxD lines. Since the COM1 is
used to the communications to the host service software PC, this mode
cannot be used with the COM1.
3 – Flash Utilities see next section 'Flash Downloading'
Amendment 1 04/97
Local loop Range:
COM2 Range:
RAE/RAK–1N
Service Software
Local loop
External loop
COM1
COM2
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