
Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice. 
Chapter 1 - Product Overview 
SNMP Access Gateway User’s Manual - v1.0 -- 11/99 - Page 2 
The serial ports may be used for pass-through access to connected serial devices, similar to a terminal server. A 
TCP/IP connection is made to the SNMP Access Gateway, and then characters received from the network 
connection is passed to the serial port, and characters received on the serial port are passed to the network 
connection. This pass-through mode may be used to remotely access the maintenance ports of equipment, etc. 
 
When more than one connection is made to the SNMP Access Gateway for access to the same pass-through port, 
then users may be allowed to ‘join’ connections. This feature can be useful in providing technical support in the use 
of the connected equipment. Two remote users, at different locations, can both have access to the same pass-through 
port. This allows a person providing technical support to see what commands or data is actually being sent and 
received, which can be quite useful when providing technical support. 
 
One of the serial ports (I/O 2) may also be used as a local command port, for configuration or checking on the status 
of the device. ‘Local Command Port Mode’ may be entered by using either a push-button located on the front panel 
of the SNMP Access Gateway or by entering a pre-defined escape sequence on the serial port itself. This local 
command port is especially useful when performing static allocation of network IP addresses, in which case the 
SNMP Access Gateway needs to be configured with an IP address prior to it its use on the network. 
 
An Events file is maintained by the SNMP Access Gateway which contains logged events, such as received alarm 
records, etc. Each type of item which may be recorded in the events log is enabled by its own configuration setting, 
so that the events file usage can be customized as appropriate for the installation site. 
 
All settings and configuration of the SNMP Access Gateway may be made remotely, using either commands via a 
TCP/IP or modem connection, or by SNMP. The SNMP Access Gateway contains a customized management 
information base (MIB) which may be used to configure and control the SNMP Access Gateway. Configuration 
settings are stored in non-volatile memory for preservation in the event of a power loss. 
 
1.2 -- IMUX 2000 Information 
When used with the IMUX 2000 the SNMP Access Gateway connects to the remote port of the IMUX using port 1. 
Port 2 is used as a craft interface to both the IMUX and SNMP Access Gateway. A serial cable is supplied for 
connection from I/O 1 to the REMOTE port on the IMUX CM3R. The power for the gateway is supplied via the 
IMUX motherboard. 
 
The unit is programmed from the factory for the proper setup for most IMUX applications. The only required setup 
by the user is to program in the proper IP address for the gateway and the destination IP address for the SNMP traps. 
 
The gateway has been designed to work specifically with version 23 of the IMUX CM3C software or any version of 
the CM3R software. When used with any of these versions, RS232 trap messages are created by the IMUX. This 
allows the gateway to generate SNMP traps as a result of a message from the IMUX. These traps will contain data 
that defines the fault condition on the IMUX. More information on these traps is contained in Application note C.