Differences

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--- energy-meters:et340 [2020-06-29 22:45] – [Option A: wireless Zigbee connection] added min. Venus version boekel
+++ energy-meters:et340 [2020-08-13 07:19] – cable extensions guy_stewart
@@ Line 33: / Line 33: @@
 On the CCGX go to the grid meter in the Wired AC sensor settings. Make sure 'Phase type' is set to 'Single phase' and 'PV inverter on phase 2' is enabled.
-===== 3. Connection to CCGX ===
+===== 3. Connection to GX device ===
 ==== Option A: wireless Zigbee connection ====
@@ Line 75: / Line 75: @@
 == note on GX firmware versions: ==
 for the new type Zigbee converters, Venus OS v2.54 is the minimum required software version
-==== Option B: Wired connection to CCGX ====
-Connect the Energy Meter to the CCGX using the USB to RS485 cable. The RS485 to USB interface cable between the CCGX and the Energy Meter can be extended up to 100 meters; make sure that the extensions of the Data+ (orange) and Data- (yellow) wires form a twisted pair.
+==== Option B: Wired connection to GX device ====
+Connect the Energy Meter to the GX device using the USB to RS485 cable. The RS485 to USB interface cable between the CCGX and the Energy Meter can be extended up to 100 meters; make sure that the extensions of the Data+ (orange) and Data- (yellow) wires form a twisted pair.
 ^ RS485 Converter ^ Energy meter ^
-| Yellow (Data-)  | Terminal  9  |
 | Orange (Data+)  | Terminal  8  |
+| Yellow (Data-)  | Terminal  9  |
 | Black  (GND)    | Terminal 10  |
 The red, green and brown wire coming out of the USB to RS485 cable are not used.
+== Note on cable length extensions and bus termination ==
+To ensure signal integrity and robust operation, particularly ensure that;
+Extension cabling complies with the minimum cross-sectional area specifications in the USB to RS485 data sheet.
+Extension cabling has appropriate shielding and twisted pair cores
+The original cable attached to the Victron RS485 to USB interface is reduced to a maximum length of 20cm in installations where the total cable length is over 10m or there are installation/site specific interference issues – in this case appropriate/high quality cabling should be used for the entire cable length, rather than only for the extension length.
+Cabling is installed separated/away from the main DC or AC power cabling.
+All wiring is properly terminated (including unused wires) and properly isolated from weather/water ingress.
+RS485 networks are traditionally terminated at both ends with 120Ω terminators. This is not required if the cable length is short and you are using the Victron supplied RS485 to USB lengths, but may be required if they are extended for longer cable runs. The ET340 meter has a built in termination resistor that can be enabled by bridging terminals 7 and 9.
+For detailed wiring/installation notes and specifications refer to the [[https://www.ftdichip.com/Support/Documents/DataSheets/Cables/DS_USB_RS485_CABLES.pdf|Victron RS485 to USB interface cable ‘Datasheet’]].
 ===== 3. Configuration =====