168
Auxiliary Area and CIO Area Allocations Section 5-3
Local Unit
receive
busy/receive
wait
Board:
CIO 190708 (port 1)
CIO 191708 (port 2)
Unit:
n + 7 bit 08 (port 1)
n + 17 bit 08 (port 2)
This flag indicates the receive status of a
local Unit (Board or Unit) during RECV when
Xon/Xoff flow control is set in the transmis-
sion control parameters.
1: Local Unit receive busy (Reception is dis-
abled because the reception buffer is
more than 4/5 (= 2 Kbytes) full.)
0: Local Unit receive wait (Reception is
enabled because the reception buffer is
less than 1/5 (= 0.5 Kbytes) full.)
This bit is cleared when the power is turned
ON, at port restart by the STUP(237) instruc-
tion or by the Port 1 or Port 2 Port Settings
Change Bit (Auxiliary Area), or when the
next sequence is started.
Startup When sta-
tus is read
After busy
status has
been
released
Tran smis-
sion control
signal status
Board:
CIO 1907 bits 03, 04,
06, 07 (port 1)
CIO 1917 bits 03, 04,
06, 07 (port 2)
Unit:
n + 7 bits 03, 04, 06,
07 (port 1)
n + 17 bits 03, 04, 06,
07 (port 2)
The status of each transmission control sig-
nal (ER, DTR, CTS, and RTS) for each port
is always read to these flags.
1: High, 0: Low
Startup When sta-
tus is read
After busy
status has
been
released
Name Address Meaning Timing
Initialize ON OFF
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