Description
A change in the value of ACC-24E2 takes effect only at power-up/reset. Therefore, to change the location where P and/or Q-variables are stored, the value of I46 must be changed, the SAVE command must be issued, and then the board must be reset. If the new value of ACC-24E2 would move the P and/or Q-variables from battery-backed to flash-backed RAM, the SAVE operation copies the variable values from battery-backed RAM into flash memory so that present values are not lost. At the reset, these values are copied from flash memory to flash-backed RAM.
Baud rates set by odd values of ACC-24E2 are not exact unless the CPU is running at an exact multiple of 30 MHz (I52 = 2, 5, 8, 11, 14, 17, 20, 23). For most of these baud rates, the errors are small enough not to matter. However, for 115,200 baud, the CPU must be running at an exact multiple of 30 MHz to establish serial communications. If the host computer baud rate cannot be made to match the Turbo ACC-24E2’s baud rate, either the Turbo PMAC’s baud rate must be changed through the bus communications port, or the Turbo ACC-24E2 must be re-initialized by resetting or powering up with the E51 jumper ON for Turbo ACC-24E2(1), or the E3 jumper ON for Turbo ACC-24E2. This forces the Turbo ACC-24E2 to the default baud rate of 38,400.
The host computer can use the character to clear out ACC-24E2’s communications buffers and make sure that no unintended responses are received for the next command. However, without an acknowledgement that the buffers have been cleared, the host computer has to add a safe delay to ensure that the operation has been done before the next command can be issued. Setting I63 to 1 permits a more efficient clearing of the buffer, because the response character lets the host computer know when the next command can safely be sent. Versions of the PCOMM32 communications library 2.21 and higher (March 1999 and newer) can take advantage of this feature for more efficient communications. I63 should be set to 0 when using older versions of PCOMM32.
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