ET-GT-232-1 Usage Tips

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Industrial Ethernet
Ethernet to RS232 Gateway

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This gateway is typically used in one of these situations:

¢	To pass a single user protocol (many are supported) from Ethernet to one (if TCP) or more (if UDP) slave RS232 serial devices (see "General Message Passthru" below) NEW 10/2004
¢	To connect a legacy SixTRAK gateway or VersaTRAK RTU to an Ethernet network
¢	To connect one Modbus ASCII or RTU RS232 slave device to an Ethernet network sending Modbus/TCP commands. For Modbus/TCP applications with multiple RS232 slave stations (such as radio applications), use the ET-GT-ST-2 or any IPm based product such as the ST-GT-1210.
¢	To connect up to 32 Modbus ASCII or RTU RS232 slave devices to an Ethernet network sending Modbus/UDP commands
¢	To connect up to 32 SIXNET slave devices to an Ethernet network sending SIXNET Universal commands
¢	To interchange between a telephone modem and an Ethernet interface (see below)

Application Idea \f14 Offer a choice of telephone or Ethernet access to your instruments

Many OEM instrument manufacturers are embedding VersaTRAK RTUs in their instruments to take advantage of the many hardware and software features in these state-of-the-art controllers. One common feature is to add a SIXNET industrial telephone modem to the instrument to provide remote access for service and data reporting. OEMs are now offering a choice of telephone modem or Ethernet gateway on their instruments, for the convenience of their customers. Both of these handy devices have the same footprint and connect interchangeably to a serial port on the VersaTRAK.

In most cases a straight-through cable can be used to connect the RS232 port of this gateway to a SIXNET serial device. This gateway is then usually connected to an Ethernet Switch with a standard 10BaseT twisted pair cable.

General Message Passthru From Ethernet to Serial Slaves

In October 2004, a new capability was added to this Ethernet to RS232 gateway to pass one user-selected protocol from Ethernet to one slave device (if TCP-based protocol) or multiple slave devices (if UDP-based protocol) connected to the RS232 port, and pass the response to these messages back to the master. This capability has the following specifications and limitations:

Messages must originate from the Ethernet port and be sent to the serial port.
The entire message must not exceed 255 characters and must be included in a single Ethernet packet.
The message content will not be altered in any manner. The entire contents within the IP packet will be delivered as is.
The user may specify one and only one IP port to be monitored.
Any reply from the slave device that arrives immediately after the completion of the transmission out of the serial port will be sent back to the sending Ethernet station. The reply must fit within and be contained in a single Ethernet packet. Only one reply will be accepted and passed on to the Ethernet IP address and source port number of the originating stations.
User settable time out will be used to determine the end of the reply message. Only after the completion of the reply or the timeout waiting for a reply will a new message be processed from the Ethernet port. (The Ethernet incoming buffer will buffer messages.)
This device supports a maximum of two TCP sessions and any number of different UDP sources. The choice of TCP or UDP is automatic, both being accepted.
This device will not pass serial port initiated messages to the Ethernet port. There is no way to connect a master device to the serial port and run this device in reverse of its intended function. This device provides no means to associate an IP address with any message received on the serial port (except to reply to a message as specified above.)

Note: SIXNET does not guarantee this device and this capability compatible with any specific protocol. Suitability of this device is left to the user to determine. Refer to the 30-day trial offer in the Ordering Information for this product.