HP 2641A Reference Manual page 82

Data Communications
Table 5-12. Keyboard Interface Straps for Block Operation Using 13260C or 13260D
Communications Accessory (Continued)
OPERATION WITH
STRAPPING
NORMAL OPERATION
STRAPPING OPTION
STRAP
OPTION (SWITCH CLOSED)
(SWITCH OPEN)
T,U Output Block Size T U BLOCK SIZE (BYTES)
C C 1/2 Data Comm Buffer (refer to switches J16, J17
on multipoint PCA).
0 C 250 max
C 0 500 max
0 0 1000 max
C
=
closed,
0=
open
V Synch Characters Asynchronous operation without SYN characters. Inserts SYN characters during Asynchronous
operation.
W Data Comm Self Test Enables DATA COMM SELF TEST from either Disables DATA COMM SELF TEST. If self test is
the keyboard or escape sequence. attempted (by either the keyboard or escape
sequence), the test will be aborted and ERROR 0
will appear on the display.
X
Data Speed Select Holds data speed signal low (CH
=
off). Sets data speed signal high (CH
=
on).
Y Transmit Indicator Lights TRANSMIT indicator on keyboard when Lights TRANSMIT indicator on keyboard when
terminal is communicating with the computer. Data Set Ready (CC) is on, and it goes out when
CC goes off.
Z Transparency No Effect Causes all data sent from the terminal to be trans-
parent.
KEYBOARD DATA COMM SWITCHES. The keyboard
data comm switches are shown in figure 5-13.
BAUD RATE
I "
134.', 1 ' , 0
I:"
• •• 11(1 2 0 0 "
; , . 7 5 - 300 ••••
I. :,0 f;OO
Parity Switch. This switch is used only with ASCII code and is ignored when EBCDIC code is used.
The settings are as follows:
ODD
=
Odd parity required
EVEN
=
Even parity required
NONE
=
"O"s parity required
Speed Switches. Block protocols can be used at speeds from 300 to 9600 baud. Speed selections
outside this range are ignored. Keyboard speed settings can only be made for asynchronous operation.
Synchronous communications speeds are selected on the Synchronous Communications Interface or
are supplied by the modem.
Figure 5-13. Block Keyboard Data Communication Switches
RANGE
-
Q Q]I
PARITY
EVEN
I
ODD
NONE
5-35