Tektronix 2221 - Page 87

1
Options and
Accessories — 2221
Operators
Table 7-8
Implementation of Specific Features for Option 12
Feature
Choice Made
Comments
Secondary Addressing
Not
implemented .
П
Indicators
Implemented
.
ADDR indicator comes on when carrier is detected .
ADDR (
carrier
detect )
SRQ (
service
request )
Implemented
.
PLOT
Implemented
Parameter
Selection
SRQ
indicator
is
on only
when
a
status
byte is
sent .
PLOT
indicator is on
when acquistions
are
locked out
during
a
waveform plot .
A ten - section
switch sets
the
instruments's baud rate ,
data
parity type , message terminator , and printer / plotter
selections .
Switch
settings are
read at
power on
only
.
Implemented
1
П
П
П
Table 7-9
RS - 232
- C
DTE
Connector
AUXILIARY
CONNECTOR
PARAMETERS
SWITCH
PARAMETERS
Signal
Name
AUXILIARY CONNECTOR
RELA
V
N.O. RELAY
COMM
+ 4.2
VOC SIG
GND
Pin
Function
Internal
External
1
Chassis
ground
CHAS
GND
CHAS
GND
EXT CLK
RELAY N.C. - X SHIELD GNO
10
П
П
2a
ITXD TXD
Transmitted
data
RS - 232.C PORT
за
IRXD RXD
Received
data
оооооооооооо
O O O O O
O O OOO
A
RS232
DTE
4
IRTS
RTS
Request
to
send
CAUTION
225 Vpk AND <
100mA ABS ,
MAX
APPLIED TO ANY
CONNECTOR
an
ICTS CTS
Clear to
send
6 IDSR
DSR
Data
set
ready
RS232
DCE
7a
Signal
ground
SIG
GND
SIG
GND
8 IRLSD2
RLSD
RS - 232 - C
DTE CONNECTOR
RS - 232 - C
DCE
CONNECTOR
Received
line signal
detect
Data
terminal
ready
20
IDTR
DTR
6530-28
П
O
O
a These lines
are all that
are
required for
communication
without hard control lines ,
Figure 7-3 . Option 12 side panel .
7-11