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Table C-4. Keyboard Interface Switch Definitions for Earlier Multipoint Code
OPERATION WITH
STRAPPING
NORMAL OPERATION
STRAPPING OPTION
STRAP
OPTION
(SWTICH CLOSED)
(SWITCH OPEN)
R
Set Trailing Pad
If
in ASCII mode (switch J07 closed on multipoint
Sets pad to 377 (octal) if any of the following con-
PCA), sets pad to 177 (octal)
+
parity.
If
in
ditions are present:
EBCDIC mode (switch J07 open on multipoint
(1) PARITY switch on keyboard is set to NONE.
PCA), sets pad to 377 (octal).
(2) Switch Z on this PCA is open.
(3) CRC-16 is selected (switch J06 on multipoint
PCA is closed).
S
(not used)
_ h
-
I-..
.........
-
h.
_
.....
.... --
-~
_
......
_.-
-r-..
V
Continuous Carrier
Continuous carrier off indicates that the modem
Continuous carrier on indicates that the modem
does not have continuous carrier.
does have continuous carrier. Allows firmware
to abort operation.
.... 1-..
_
.....
.... 1-.
.....
I-..
....1-.
-I"'
-r-..
..........
-r
-
.....
Z
Parity
The PARITY switch on the terminal keyboard is affected as follows:
None: (Force 0). Send 8 bits and receive 8 bits.
None: (Force 1). Send 8 bits and receive 8 bits.
Force bit 8 to zero. Check for parity error.t
Force bit 8 to one. Check for parity error.t
Odd Parity: Send 7 bits
+
odd parity. Receive
7 bits
+
odd parity. Check for parity error.
Even Parity; Send 7 bits
+
even parity. Receive
7 bits
+
even parity. Check for parity error.
tAllows Transparency Mode.
Odd Parity: Send 7 bits
+
odd parity. Receive
7 bits
+
odd parity. Check for parity error.t
Evon Parity: Send 7 bits
+
even parity. Receive"
7 bits
+
even parity. Check for parity error.t
Table C-5. Multipoint Communications Interface Switch Definitions for Earlier
Multipoint Code
1
STRAP
I
S _ T o _ R _ : r _ ~ _ 6 _ 1 ~ _ G
_ _
I
DE_S_C_R_I_PT_1_O_N
1
- I " '
.....
......
.... r-
-
.....
J05
Sync Mode (Asynchronous
Open: Enables the insertion and deletion of sync characters to be compatible with a single, generalized
Interface Only)
data communications driver.
Closed: Sync Mode disabled.
... 1--.
.....
h.
.... 1-..
.... 1-..
...........
.....
......
-r-
....r-
J15
Block Mode
Opon: An entire input block must be received correctly before being processed by the terminal firmware.
(See Block Check Character.)
Closed: Each character is processed by the terminal firmware as it is received from the computer.
C-4
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