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These Ethernet
to Serial Gateways support Modbus over TCP/IP (Modbus/TCP per
Modicon's specifications
from www.modicon.com), Modbus over UDP (which is faster than TCP
but has less error checking), the SIXNET protocol (over TCP/IP or
UDP) and many other protocols (only units shipped after Nov. 04).
SIXNET offers a 30-day free trial to verify if this gateway
will work in your application.
These Ethernet
to Serial Gateways can connect to just about any any serial (RS232
or RS485) slave device that supports either Modbus ASCII, Modbus RTU,
SIXNET or other protocols (only units shipped after Nov. 04). In addition,
a master Modbus (ASCII or RTU) device such as an operator interface
panel can be interfaced. The master device would read/write to virtual
I/O registers in the Ethernet gateway and then this data can be accessed
over Ethernet.
Yes. An
EtherTRAK I/O module has some of the same features of the ET-GT-485-1
Ethernet to Serial
Gateway - plus it has I/O built-in. However, an EtherTRAK I/O
module only supports the Modbus and SIXNET protocols. The Ethernet
gateways shipped after Nov. 04 also support other protocols.
No. We do not
currently have any software of this type.
I
just got my Ethernet to Serial Gateway. What should I do first?
First, install the
SIXNET I/O Tool Kit software. Then power-up and connect your gateway
to your PC via an Ethernet hub (use straight-thru cable) or a direct
Ethernet connection (use cross-wired cable). Next, refer to the getting
started help in the SIXNET I/O Tool Kit. Follow the prescribed steps
to configure your gateway. (Note: These gateways are configured the
same as an EtherTRAK I/O
module.) Then connect your slave device to the serial port of the gateway.
Now you should be able to communicate over Ethernet through the gateway
to your device. Make sure your have selected the appropriate passthru
mode (i.e. Modbus, SIXNET or Generic).
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Why
can't I communicate to my Ethernet to Serial Gateway from the SIXNET
I/O Tool Kit over Ethernet?
First,
make sure that the serial number you entered into the
SIXNET I/O Tool Kit software exactly matches the one on your gateway.
Make sure TCP/IP is installed on your computer. Run a DOS window and
try a ping command (example: ping 10.1.0.1). If you get a "command
unknown" error then TCP/IP may not be installed. Try reinstalling
it in Control Panel - Network. If you get a "destination host unreachable"
error then the IP address of your gateway is not appropriate for your
network. If you get a "request timed out" error then check
your cabling. Make sure the LNK LED on your gateway is on steady. If
not then you have a wrong or bad cable. A direct Ethernet connection
from your PC to the gateway requires a cross-wired 10Base-T cable. A
connection to a hub requires a straight-thru cable. For more details
on Ethernet troubleshooting refer to the
SIXNET Knowledge Base help file.
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I
can communicate over Ethernet to my gateway from the SIXNET I/O Tool
Kit but why can't I communicate to my slave device through the gateway?
First,
make sure the serial port parameters (passthru protocol, baud rate,
etc.) on the gateway are configured to match those of your slave device.
For RS485 connections make sure you have the proper termination and
biasing. See the User Manual and help files for details. Also, make
sure the RS485 signal ground is connected between the gateway and slave
device. For the software driver that you are using make sure you have
specified the correct IP address of the gateway, station number of the
device, port 502 (if Modbus), and the appropriate I/O addresses.
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