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ADVANCED SET-UP
Machine Access Box RAS
DOC_DEV_RAS_User guide_A
Page 123
USB gateway
16.1
Overview
The USB to IP gateway is able to forward IP traffic from devices connected to the Ethernet network to a USB
device.
On the USB interface, the ETIC router behaves like a USB host and a PPP client.
The USB device connected to the ETIC router USB interface must behave like a PPP server.
Destination IP address; main case
When a device, connected to the Ethernet network, needs to transmit data to the USB device, the destination
address of the IP frames which need to be transmitted to the USB device must be a specific IP address
assigned to the USB gateway of the RAS-3G (see the configuration below).
Destination IP address; Modbus case
If no
specific
IP address is assigned to the USB gateway (see below), the RAS-3G forwards only modbus TCP traffic to
the USB interface.
The destination IP address of the IP frames must be the LAN IP address of the RAS-3G router.
16.2
Set-up
Select the “Setup” menu and then the “USB” menu.
“Activate” checkbox :
Select the “Activate” checkbox.
“Use a specific IP address” checkbox :
If modbus TCP traffic only has to be forwarded to the USB device, that checkbox must not be selected.
If other kinds of traffic have to be forwarded, that checkbox has to be selected.
“Specific IP address” parameter :
If modbus TCP traffic only has to be forwarded to the USB interface, no IP address has to be entered.
If other kinds of traffic have to be forwarded to the USB device, an additional IP address must be assigned the RAS-3G.
That address belongs to the network connected to the LAN interface of the RAS-3G. It is the IP address of the USB
gateway.
It will be used as the destination IP address of the IP frames which must be forwarded to the USB device.
“Accept WAN traffic” checkbox:
It is necessary to select that checkbox it the PC is connected to the network through the ETIC router the WAN interface.
It is not necessary to select that checkbox if the remote PC is connected to the RAS through a VPN or through the LAN
interface.
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