Character Mode Transfers; Configuration Status Byte Contents - HP 262SA Reference Manual

Data Communications
7
6
5 0
\ GID DID
i8P
':r
Bee PAD
~
BYTE 1
I
PARITY
I
1
I I
'·'I~~
PARITY~
Example: Status bytes "i@P" would be interpreted as follows'
00 = Force O's or 1's
"i"
1101000 = odd parity
01 = Even "@"
100000o = ASCII. LRC.
<
1000 byte buffers
10 = Odd
"P"
101
0000
= no data. terminal in remote
11 = 8-bit data
6 5 4 3
0
MULTIPOINT STATUS BYTES
BYTE 2
I
PARITY
1
1
I I
I I I
@
100
0000
110 0000
CODE~
L.J
I
A 100 0001 a 110 0001
Data Source
B 100 0010 b
110
0010
0= ASCII
Address Feature
C 100 0011 110 0011
1
=
EBCDIC
o
= Data source
c
address
D 100 0100 d
110
0100
BLOCK CHECK
E 100 0101 110 0101
1 = No effect
e
0:= LRC
F 100 0110 f 110
0110
1
=
CRC-16
~ BUFFER SIZE
G 100
0111
9
110 0111
EXTENDED TEXT FEATURE
00
<
1000
H 100 1000 h 110 1000
o
=
no effect
01 = 1000 to
<
2000
I 100 1001 110 1001
1
=
Extended Feature
10 = 2000 to
<
4000 J 100 1010 110 1010
11
>
4000
K
100 1011 110
1011
L 100 1100 110 1100
M 100
1101
m 110 1101
7 6 5 4 3
2 0
N 100
1110
110 1110
I
PARITY
I
1
I
10
I
0
I
1
I
0
I
0 100
1111
0
110 1111
BYTE 3
P 101 0000 111 0000
P
WAIT TO TRANSMIT
~
I
a
101 0001 q 111 0001
1 = Terminal is ready to send
BUSY (Used with
R
101 0010 111
0010
o
=
Terminal has no data
printerWRU)
S 101 0011 111 0011
0= Not busy
T 101 0100
111
0100
1 = Busy
U 101 0101 u 111 0101
V 101 0110
111
0110
W 101 0111 w 111 0111
X 101 1000
111
1000
Y 101 1001 111 1001
Z 101
1010
111 1010
TERMINAL MODE
[ 101 1011
111
1011
"- 101 1100 111 1100
Terminal WRU PrinterWRU
J
101 1101 111 1101
101 1110 111
1110
o
= Terminal is in Local
o
= Printer is offline
101 1111 111 1111
1 = Terminal is in Remote 1 = Printer is on line
Figure 7-18. Configuration Status Byte Contents
Character Mode Transfers
Character mode transfers are not used in an HP multipoint environment. All data is trans-
ferred in block form.
7-30