905U-G Wireless Gateway
User Manual
Page 139
©September 2004
now expects the 905G to be in monitor comms mode, and will decode all radio
communications.
The display will show radio messages transmitted and received. Messages starting with RX
are received messages, CMD are transmitted messages and ACK are acknowledgment
messages. At the end of each received message is the RSSI (radio signal strength indication)
in dBm.
If you select any message line with the mouse, information about the message will be
displayed at the bottom of the screen - the system address, RSSI and CRC (error-check)
status. The “text box” at the bottom middle of the screen decodes the message - that is, it
decodes the message to display I/O channel and value. Note – Configuration software can
only decode the message completely if the same configuration project corresponding to the
system being monitored is open.
You can display the register values in Decimal by selecting “Dec” at the bottom of the
screen. If you select “Dig”, the values will be displayed as a 0 or 1 digital value (1 if the 16-
bit value is greater than 50% - that is, the most significant bit is 1). If you select “Anlg”,
the value will be displayed as a 4-20mA range.
To stop the decoding of “comms logging”, select the “Stop Comms” button. You should then
also stop the 905G from outputting radio comms by pulling up the terminal menu (i.e. press
“terminal” and then hit enter in the terminal sceen) and selecting “d) Disable Comms
Logging”.
Option e) Add Time Stamps
This option in the debug menu will add a timestamp to each displayed radio message. The
timestamp is based on the 905G internal real time clock. This option is normally used only if
monitoring is done from a terminal package only, and configuration software is
not
being
used to decode the communications.
When configuration software is being used to decode the radio comms (see above) time
stamps can be added by selecting the “Time Stamps” checkbox. This will display the current
time and date (according to the PC Clock) alongside each message. The “Comms log” can be
saved to a file for future reference by selecting “Log to File”.
Option f) Current System Address only
This option will ensure that only radio messages that have the same system address as the
connected 905G are displayed. If you have another system with a different system address
these messages will not be displayed if you choose this option. This option is useful where
there is more than one system in the same area so that only the radio messages relevant to the
desired system will be displayed.
Option g) Display Configured Protocol Driver
This option displays the configured Protocol Driver for this unit e.g.
Configured Protocol is: Ethernet TCP-IT
Option h, i, j, k) Enable/Disable Fieldbus Read/Write Area
(These options not available on the Modbus/DF1 version)
This option is used to halt data exchange between the Fieldbus Interface and the Radio
Interface (I/O Registers). This is mainly used when trying to read or write image arrays. If
the Fieldbus read area “h” is not disabled when trying to read or write to the I/O registers
