User`s manual

PK2100
Software Reference s 5-11
It may seem to be contradictory to write to ROM, but this is
possible with flash EPROM, where the flash memory is
treated as nonvolatile memory.
Flash EPROM is rated for 10,000 writes. Z-Worlds experi-
ence has been that flash EPROM seems to last for at least
100,000 writes. Nevertheless, there is a limit after which the
flash EPROM chip will need replacement.
!
The data are placed in RAM, not ROM, when some form of initializa-
tion is not included when the data are declared. The function then will
not work.
Communication
RS-232 Communication
Z-World has RS-232 support libraries for the Z180 port 0, and for the
RS-232 expansion card that interfaces through the PLCBus to the
PK2100. Functional support for serial communication includes the
following functions:
 Initialization of the serial ports.
 Monitoring and reading a circular receive buffer.
 Monitoring and writing to a circular transmit buffer.
 An echo option.
 CTS (clear to send) and RTS (request to send) control.
 XModem protocol for downloading and uploading data.
 A modem option.