MTS SWIFT 40 Sensor - Manual (Page 38)

SWIFT 40 Sensors 38
Transducer Interface
Hardware Overview
Address selector
Each TI in a communications chain has a unique address. This address is used in
every read or write command from the host computer. The host can transmit to
only one TI at a time, using its assigned address. The TI will reply to the host
when it has received a command.
The address selector switch allows you to set the communication address for the
TI. When multiple TIs are connected, each must have a unique address. The
address must be 1 to 9. Address 0 is used only for broadcast messages from the
host. In the case of broadcast messages, the TI does not respond to the host.
To change an address, insert a small screwdriver in the slot and turn the dial until
the arrow points to the desired address number.
Note Make sure every TI on a communications chain has a unique address. If
you set two TIs on one communications chain to the same address, you
may experience unpredictable communications errors.
If two TIs on one communications chain have the same address, communications
to either TI will be unreliable. (The errors are unpredictable, but will probably be
parity or framing errors.) Assigning the same address to two TIs does not damage
the hardware.
Transmit Indicator
The green Transmit indicator lights to indicate that the TI is transmitting
information via the COMM IN connector.
FAIL Indicator
The red Fail indicator lights to indicate that a fail condition exists on the board.
Depending on the failure detected, the Fail indicator will either be on constantly
or will flash a repetitive pattern that can be used to identify the failure detected.
Certain failures are considered critical, and will result in the TI becoming
completely unusable. These failure conditions must be resolved before the TI can
be used. If a critical failure occurs, the Fail indicator will only blink the cause of
the first critical failure. This failure code will be repeated approximately every 1
second.
Non-critical failures indicate impaired system functionality, which, in most
cases, can be corrected operationally from the communication interface. Non-
critical failure codes are checked cyclically, so that multiple failure conditions
can be communicated. Failure codes are indicated approximately every 1.5
seconds.
The following table lists fail conditions and the manner in which the Fail
indicator indicates the failure.