Model 920 Ethernet Data Multiplexer Manual
Focal Technologies Corporation
Page 3-1
A Moog Inc. Company
920-0603-00 Rev K
3.0
Diagnostics Functionality
3.1 Network Settings and Accessibility
3.1.1 IP Address Configuration
Each Model 920 is assigned a unique MAC address during factory configuration. The MAC address is marked
on the enclosure, and recorded at the factory with cross-reference to serial number, and thereby customer and
order, should it ever need to be retrieved.
The IP address for the Model 920 can be assigned statically or dynamically using DHCP. Either mode can be
enabled remotely using a virtual Telnet terminal over the Diagnostic Ethernet port, followed by powering cycling
the device after the changes have been submitted to the card.
By factory default, the Model 920 obtains an IP address using DHCP (i.e. dynamic IP allocation), configured
with a 30 second timeout. If the connecting network does not support DHCP to provide the Model 920 with a
dynamic IP within 30 seconds, the Model 920 will automatically revert to use locally stored (i.e. static) IP address
and network settings. Factory Default Network Parameters are shown in Table 13.
Table 13: Factory Default Network Parameters
Network Parameter
Factory Default
Setting
IP address
192.168.0.100
Subnet
255.255.255.0
Gateway
192.168.0.1
Primary DNS
8.8.8.8
Secondary DNS
8.8.4.4
3.1.2 IP Connectivity
The Model 920 hosts up to two
simultaneous
IP connections using the Diagnostic Ethernet port. These
connections include the following:
Modbus TCP -
The Modbus TCP connection has full control and diagnostic access.
Telnet -
There is a limited set of commands available. Used primarily for IP address and network
setting configuration.
3.2 Diagnostics and Control via Modbus TCP/IP
Modbus TCP protocol is used to provide diagnostics and user control messages via a TCP/IP connection to the
Model 920. The Modbus TCP protocol stack is illustrated in Figure 12. SFP registers, card status, and control
registers are accessible via Modbus TCP/IP over the Diagnostic Ethernet port.
