Extended Asynchronous Communications Interface Strapping Options - HP 2641A Reference Manual

Table 7-6. Extended Asynchronous Communications Interface Strapping Options
Installation
STRAPPING
STRAP
OPTION
DESCRIPTION
FCO
(Not Used) (This switch should always be open.)
thru
FC7
BO Custom Baud
The switches are set to the binary equivalent of a number determined by the formula:
thru Rate Select
B7
INT ( 153600) - 1
baud rate
(See example in figure 5-10.)
134
134.5 Baud (This switch should always be open.)
SO Transmit Baud SWITCH SETTING
TRANSMIT BAUD RATE
thru Rate SO S1 S2
S2
0 0 0
Transmit baud rate
=
receive baud rate.
0
C
C 110
C
0 C 150
0 0 C 300
C C
0 1200
0
C
0 2400
C C C
Custom
0=
open, C
=
closed
CBE Custom Baud
Closed: Enables custom receive baud rates. (The keyboard BAUD RATE switch must be set to EXT.)
Open: Receive baud rate is set by keyboard BAUD RATE switch.
B8
Custom Baud
The switches are set to the binary equivalent of a number determined by the formula:
thru Rate Select
B11
INT ( 153600 ) _ 1
baud rate
M,A9 Module Address
Provides PCA address so that firmware can address the PCA. These switches should always be set to 10,
thru
(M open, A9 thru A11 closed).
A11
IAT Inhibit
(This switch must be closed when receive handshake is used.)
Attention
ATN2 Enable (This switch should always be open.)
Attention
Two
THE Transmit
Closed: Permits the associated external device (a or computer) to signal a "busy" condition on CB (Clear
Handshake to Send) or SCF (Secondary Carrier) control lines and temporarily stop data transmission from the terminal.
Enable
Open: Transmit Handshake
disabl~d.
RHE Receive Closed: Permits the terminal to signal a "busy" condition on the CD (Data Terminal Ready) control line and
Handshake temporarily stop data transmission from the associated external device (a computer).
Enable
Open: Receive Handshake Disabled.
NOSB
SCF Inhibit Closed: Inhibits RS232 SCF (Secondary Carrier) control line.
Open: Enables RS232 SCF (Secondary Carrier) control lines.
2SB Stop Bit Select Selects the number of stop bits to be appended to the data bits during transmission.
Closed: Selects 2 stop bits.
Open: Selects 1 stop bit.
NOTE: Selecting 110 baud automatically appends 2 stop bits.
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