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To ensure that the Setup parameter values currently in use are saved while the TCS is turned off,
a Save Setup command must be executed. The Save Setup command causes the TCS to store the
Setup parameters in nonvolatile Setup memory for automatic recall at the next power-up. (The
Save Setup command is described in detail later in this chapter.)
The programmer should be aware of three special cases regarding the permanence of changes to
operating parameters:
1.
The setting of the Local/Remote Mode is never saved and is always restored as "remote."
This is a safety device that ensures the TCS never powers up or resets into the Local Mode,
which could confuse the user or, in installations where the user is barred from the Setup
Screen, trap the TCS in the Local Mode.
2.
The reporting format is preserved during power losses.
This ensures that the TCS uses the correct reporting format when it sends a power-up
interrupt to the host. (The TCS sends a power-up interrupt only if the Power-Up Interrupt
Mode is set.)
3.
A hard reset, available only to the host, does not affect the communication-related
parameters (Address, XON/XOFF Mode, Baud Rate, Data Bits, Parity Enable, Parity Sense,
Stop Bits, Hardware Handshake, and Transmit Mode). The host cannot, therefore,
inadvertently disrupt communication.
NOTE
A remote soft reset is not recommended because it could change communication parameters. However, if
the host is to perform a soft reset, the soft reset should be preceded by a Save Setup command to ensure
that communication parameters currently in use are not changed.
If display activity is set to "off" and saved with a Save Setup command, the next time power is applied to
the TCS, the TCS starts up with the screen off.
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