MTS SWIFT 20 Ultra Sensor - Manual (Page 38)

SWIFT 20 Sensors 38
Low-Profile Transducer Interface
Hardware Overview
Address selector
Each Low-Profile 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 Low-Profile TI at a time, using its assigned address. The
Low-Profile 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
Low-Profile 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 Low-Profile 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 Low-Profile 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 Low-Profile TIs on one communications chain have the same address,
communications to either Low-Profile 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 Low-Profile 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 Low-Profile TI
becoming completely unusable. These failure conditions must be resolved before
the Low-Profile 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.
Error Codes for the Fail Indicator (part 1 of 3)
Fail Indicator State
[Number of blinks:]
Error
Off No error detected
Continuous On Critical: Boot failure; bad code in boot block
Fast blinking Critical: Unanticipated exception prior to relocation of loader code
Fast varying blink Critical: Unanticipated exception after relocation of loader code
1 Critical: SRAM failure