812
Serial Communications Instructions Section 3-23
CPU Bus Unit Area
n = 1500 + 25 x unit number
Examples When CIO 0.00 is ON in the following example, communications sequence
No. 101 (0065 hex) will be executed for port 2 on the Serial Communications
Unit with unit number 0 as long as the Communications Port Enabled Flag for
port 7 (A202.07) is ON and the Protocol Macro Execution Flag (CIO 1500.15)
is OFF.
If an operand is specified for the symbol in a send message, 2 words of data
starting from D101 will be used as the send area (because the contents of
D100 is #0003).
If an operand is specified for the symbol in a receive message, 2 words of
data will be stored starting from D201 and the number of words received +1
will be written to D200.
Name Address Contents
Port 1 Protocol Macro
Execution Flag
Bit 15 of
CIO n+9
ON when PMCR(260) is executed. The flag
will remain OFF if execution fails. The flag
will turn OFF when the communications
sequence has been completed (either an
end or abort).
Port 2 Protocol Macro
Execution Flag
Bit 15 of
CIO n+19
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