Differences

This shows you the differences between two versions of the page.

--- connecting_external_devices [2018/07/10 10:35] – created akuzmuk
+++ connecting_external_devices [2018/07/11 09:07] – [Connection Diagnostics] akuzmuk
@@ Line 49: / Line 49: @@
 First of all, after connecting the device and creating a connection, you can create a register in a known state, for example, the bit "always on", etc. After the register is created, its value (Value) will be displayed with the register list:
-{{ ::read-error.png?direct&600 |}}
+{{ ::read-error.png?direct&912 |}}
-A dash line instead of value means that there is no connection. If there appears, first check the cable and the settings on both sides again.
+A dash line instead of value means that there is no connection established. In this case first double check the cable and the settings on both sides. Cables are sources of issues in most cases.
-To deal with communication issues on the built-in RS-485 port TX/RX LEDs on the front panel will help with diagnostic - during normal operation they should flash alternately.
+To deal with communication issues on the built-in RS-485 port TX/RX LEDs on the front panel could be used. During normal operation they should flash alternately. At first blinks TX LED and then blinks RX LED.
-In the absence of RX - it is clear that the device does not respond at all, i.e. the format or speed of the exchange may be incorrectly configured.
+In the absence of RX blinks it is clear that the device does not respond at all, i.e. the format or speed of the exchange may be misconfigured. Or there is issue with wires.
-If the RX LED flashes in an irregular manner, as if "breaking through" through a uniform flashing TX is likely to be in the presence of strong electromagnetic interference, it is necessary to follow the recommendations for RS-485 connection.
+If the RX LED flashes in an irregular manner, as if "breaking through" a uniform flashing TX is likely to be in the presence of strong electromagnetic interference, it is necessary to follow the recommendations for RS-485 connection.
 If the value is read but incorrect - the wrong data type is specified in the register description, so for example only the parameter byte can be read instead of the whole word.