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7.4
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
922-DSLH. The Modbus TCP protocol stack is illustrated in the figure below. Local card status and control
registers are accessible via Modbus TCP/IP from the topside or other subsea equipment over any Ethernet port.
7.4.1 Diagnostics and Modem Status
Remotely accessible, real-time diagnostic data and status information is available from the Model 922. This
information can be used to determine real-time state of health or to monitor long-term trending of critical
parameters to estimate the remaining life of the unit.
Diagnostic and status information is retrieved from the following:
1. On-board microcontroller (uC DIAG). A bank of ADCs is used to monitor board voltage rails. The uC
also provides status information such as serial number, MAC address, IP address and other network
settings.
2. Onboard sensors including a temperature sensor, humidity sensor, current monitor, and ON time
counter.
3. Status of the on board optical transceiver diagnostics (including optical link, transmit and receive optical
power levels).
4. Status and configuration of the serial to Ethernet gateway channels.
5. Status of the DSL link such as the DSL Mode, Bitrate, TC-PAM, SNRM and LATN. Note that DSL
parameters such as Device Mode (STU-C/R), Ratemode, Bit Rate and PAM can also be configured and
save it in the card using the sample GUI.
6. Status registers of Ethernet Switch. Key Ethernet status indicators are:
Link (speed/duplex) and activity status of copper Ethernet ports
Port mirroring/monitoring/sniffing
MIB counters for statistical gathering of dropped packets, CRC errors, packet sizes,
unicast/multicast, etc.
Diagnostics and status information are retrievable using Modbus TCP over any Ethernet port. Most diagnostic
information is available using the Modbus TCP register map, per section 10.0. Limited configuration information
is available over the Telnet as described in section 8.0.
Focal Technologies Corporation
A Moog Inc. Company
Figure 7-1: Modbus TCP Protocol Stack
Model 922-DSLH – User Manual
Document No. 922-0677-00, Rev 1.0
Page 7-3
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