IBM System/360

27 02 TRANSMISSION CONTROL
Command Decoding
LCW LCW LCW
Channel
2702
Command Byte In put
Command Mode
TC
Command Command to 2702 (Bus Jn)
Field Field Field
p
0
1
2 3 4 5 4 5
6
7
4 2
1
2
1
Sense
Sense
0
0 1 0
Write
Write
Auto Wrap 0
0
0
0 0
1 1
0
1
0
1
Dial*
1 1
0
1
0
Break
0
0 0
0
0
1 1 0
1 1 1 0
1
Poll
1
0
1 1 0
0
Read Read
0
1
Prep Rd
Inhibit
1
0 0
0 1 0
1
0
1
0
1
Search
0 1
Control SADZER
SADONE
0
1
0
1 1 1
0
SADTWO
0
1 1
0
1 1
0 0
1 1
0
1 0
SADTHREE 0
0 0 0
1 1 1 1 1
0 0
1 1
0
1 1
Enable
1 0 1 0 0 1 1 1 0 0 1 1 0 0 1
Disable
011110 1 1 1 1
No-Op
1 0 1 1
Pseudo
1 1 1 1
* Decoded by channel as write command and by 2702 as control command.
IBM CONFIDENTIAL
S/360 75