HP 262SA - Page 182

Block Data Transfer
Table 9-2. Handshake Mode Interpretation from Configuration
G
InhHndShk(G) strap
H
Inh DC2(H) strap
B
Block Mode
(1)
D
Line (O)/Page (1) mode
Character mode (0)
(D strap)
N no handshaking x
don't care
HI
DC1 handshaking
H2
DC2 handshaking
TYPE OF TRANSMISSION
ENTER
STATUS FUNCTION MODIFY
KEY
Ec d REQ
KEY
MODES
GHBD N HI H2 N
HI
H2 N HI H2 N HI H2 N HI H2
0
0
0 0 1 1 1 1 1
0 0 0 1
1
I 1 1
1
0
0
1
0
-
1 1 1 1
x
0
0 1
1 1 1
1 1
x
0
I
0
0
1 I I
I
I
0
1
0 I
1 I 1
1
1
0
1 1
0
1
1
1 1 x
0
1 1
1
I
1 1
1
x
1 0 0
0
-
1 1
1
1 1
1
0
0 1
1
1
I 1 1
1
0
1
0
-
1
1
I I
x
1 0 1 1 1 1
1
1 x
1 1 0
0
1
1 1 1
1
1
1
0 1
1 1 I 1
I
I
1
1
0
1 1 1 1
x
1 1 1 1
1 1
1 1
x
These values reduce to the formulae below (the symbol (( --" indicates a logical NOT
function):
ENTER
NONE
= (-G)( --B) +H
key:
DCI
=0
DC2
= (--H)( G + B )
9-4