IBM 3704 Reference Manual page 36

Program
Actions
Chart 884
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BB4
Bl
RETURN TO CHECK
LINE AT
INTERVALS
LZ INTERRUPT
!ERROR SETI
OUTPUT
SET PCF•F
IOISABLE THE
LINE!
LZ INTERRUPT
!MODE CHGI
z
MODEM ERROR
IN
1cw·
TIME FORM OUTPUT
TO SVC REQ1
T.6 MS MAX
1.6 US MIN
z
Program Actions
(Type 1 Scanner)
Hardware Actions
(Type 2 Scanner)
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Line Set and External
Modem Interface
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DISCONNECT OF
~---------------ILINE
DROPS DATA
SET READY
~~~se~~TL8~sTg~M~~~~IE= 1 t~
~~ul'M 3 T2 5 TH~D~~hm
LINE
AT A SPACE TO THE LINE
INTERFACE LONG ENOUGH TO BE
CLOCKEO AS A START BIT.
THIS WILL RESULT IN A CHAR SVC
INTERRUPT 6T.5 MS AFTER THE RCV
SPACE IS DETECTED. THE MODEM
ERROR BIT WILL BE ON IN THE ICW.
+~EAP~~~A~v~u!i ~~tE~~s~:~tE~HE
ICW PERIODICALLY TO DETECT
THE MODEM ERROR THAT I S
SIGNALING THE DISCONNECT.
RESET ALL CTRL
>-------------~
LATCHES, DROP
ATA TERM READY
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5
Figure 7.
Example
of Switched-Duplex Service-Programmed for the IBM 2741 Communic~tions Terminal (Part 4 of 4)
30 IBM 3704 and 3705 Communications Controllers Original Equipment Manufacturers' Information
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