Siwarex WP321, SIWATOOL

Hi,

just wanted to add, after struggeling for a while, you should be aware of the used USB-converter.
You should look for a USB/RS485-convertor wich is capable of connecting RS485 by means of the 2Wire-architecture (and not the 4wire architecture.)Finding the pinout of your device with an explicit text "2Wire-pinout" helps to insure the device can be connected correctly.

I tried to remap the pinout (RxD-/+, TxD-/+, RTS/CTS,...) only to find out that the USB/RS485-convertor only supported a 4-wire connection of RS485.

If you look at the specs of the convertor that Siemens proposes, you'll see that it's a 2-wire RS485 (A,B,X-terminals) only.

I eventually ended up using a Moxa NPort5130*, in Realcom-mode (as a COM-port, configurable with the NPort administrator on a PC, connected to the Moxa Nport5130 ethernet connection).

The port was configured as RS485 2wire inside the NPort5130 module, and Realcom-mode was selected in its settings too.

*I'm not afiliated with Moxa and I'm only mentioning this name because this was the module I had available while doing this intervention.

The particular pinout I used

for Nport5130: pin 3 = Data+ (B) is for Siwarex WP321 RS485 D+, connect on ET200Sp-terminal 13

for Nport5130: pin 4= Data- (A) is for Siwarex WP321 RS485 D+, connect on ET200SP-terminal 14

So:

-install Siwarex WP321 module in white base-unit (connecting to a PLC is not needed)

-hook up 24VDC and 0V to that base-unit

-make a DB9-connector (in my case a female DB9-connector) with two wires connected to pin 3 and pin 4

-connect wire of pin 3 to base-unit terminal 13

-connect wire of pin 4 to base-unit terminal 14

-make a wire bridge on the base-unit between terminal 9 and 11

-make a wire bridge on the base-unit between terminal 10 and 12

-connect subd9-connector to Nport5130

-connect ethernetport of Nport 5130 to PC

-set IP-address of PC and Nport5130 in the same range

-browse to the Nport5130-IP-address via webbrowser and set port 1 to realcom mode, set protocol to RS485 2-wire (baudrate aparently doesn't matter I used 9600, Parity Even, rest unchanged)

-install Nport adminstrator on the PC and map a free COM-port to the Nport5130 IP-address

-Open Siwatool V7.0, select the COM-port you justed configured and click connect.

-the status should turn to 'Online'

In case you see 'refreshing error' and 'Offline' or a frozen process bar: check electrical connections between base-unit and Nport5130