MX08 Multichannel Weighing System, Technical Manual, Rev. 2.5 Page 67 of 144
8.7. Diagnostic Tests
RC-232C and RS-485 serial interface tests can be performed sequentially in this test
menu.
For entering diagnostic test mode, press the programming switch before power on and
release the switch after power on the instrument. The instrument will go into RS-232C
RXD test mode which is indicated by lighted Pwr LED and flashed Err LED as seen below.
The status of LEDs on the front panel indicates test steps and the test result as described
below. You can go to the next test by pressing the programming switch.
Test
LED’s Status
Description
Pwr
Lnk
Err
RS-232C RxD
Pwr LED blanks 0.3 sec after receiving any
data. Press programming switch to go next
test.
RS-232C TxD
‘A’ to ‘Z’ characters are send sequentially in 0.8
s period. If the same data is received, Pwr LED
blanks 0.3 sec. Press programming switch to
go following test.
RS-485 RD
Pwr LED blanks 0.3 sec after receiving any
data. Press programming switch to go following
test.
RS-485 TD
‘A’ to ‘Z’ characters are send sequentially in 0.8
sec period. Press programming switch to go
following test.
Blank Light
Flash Blank for 0.3 second
Table 7.3 - Diagnostic test sequence
If you short circuit RXD and TXD pins on RS-232C port and go in to TxD test, the receiving
data is shown by Pwr LED.
Press programming switch for 5 seconds to exit diagnostic test mode and go to operation
mode.
