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North Star HSIO-4
Conversely, to establish a communication link
between the HORIZON and another computer that
simulates a modem, you must configure an
HSIO-4 port to simulate a terminal. To
configure an HSIO-4 port as a terminal, you
must wire the Configuration Header for the
relevant port according to the specific
procedures in Section 3.2.2 for asynchronous
operation or Section 3.3 for synchronous
operation.
BAUD RATE
The data transmission speed (baud rate) of the
two communicating devices must be the same.
Baud rates for each port can be programmed
independently to a range of commonly used baud
rates. For a list of available baud rates and
specific programming instructions, refer to
Section 3.2.3 for asynchronous operation, or
Section 3.3.2 for synchronous operation.
FORMAT CONVENTIONS
Both communicating devices must use compatible
format conventions.
include:
the number of data bits per
character, the type of parity, the baud rate
factor (lx, 16x, or 64x) , the number of stop
bits per character (for asynchronous
operation) and the sync character(s) (for
synchronous operation).
Format conventions are established by
programming the USART, which can accomodate a
variety of conventions.
North Star TSS/A) that has been written
specifically for use with the HSIO-4 contains
USART initialization routines, which
define and establish the required format
conventions. For the convenience of the
programmer writing software for the HSIO-4, a
17
Format conventions
Software (such as the
User/Technical Manual
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