Teletype SA110 Description And Operation page 22

SECTION 578-200-100
form on Figure 12. Refer to 8717WD for a com-
plete schematic and to 8567WD for actual wiring
information.
(a) The bypass switch, SWl, is wired simi-
larly to those for bypass switch assem-
blies TP327631 and TP327633. In the bypass
position (as shown on Figure 12 ), the data set
output is fed in at pin 5 on the orange wire,
transferred to pin 4, and fed out to the receiv-
ing distributor input of the terminal on the
yellow wire. Since pin 2 is closed to pin 6,
the data output of the SAl 10 (white wire) is
connected to the data input of the SAl 10 (red
wire). The white-purple wire brings +17.5
volts from the data set (via the DATASFEED
receiver) to pin 8, where it is transferred to
pin 7 and connected by the white- slate wire
to the supervisory transmitted data input of
the data set, holding reverse channel on at
all times. The slate and purple wires connect
to the relay break contact in the SAll0.
(b)
When SWl is adivated, the data set out-
put at pin 5 (orange wire) is transferred
to pin 6 (red wire) where it is supplied to the
data input of the SAll0. The data output of
the SAl 10 (white wire) at pin 2 is transferred
to pin 4 (yellow wire) where it is supplied to
the input of the receiving distributor. This
places the SAll0 in series with the incoming
data stream between the data set and the ter-
minal. Also, the white-slate and white-purple
wires at pins 7 and 8 are disconnected and
the break contact of the SAll0 relay is inserted
between them in series. When energized,
this relay opens the path to the supervisory
transmitted data input, thereby causing a
break on reverse channel to be generated.
4. 10 The wiring for bypass switch and indi-
cator assembly TP327638, the SAll0
chassis, the terminal, and the data set is shown
in simplified form on Figure 13. Refer to
8717WD for a complete schematic and to 8567WD
for actual wiring information.
(a) The bypass switch, SWl, has four trans-
fer contacts but only three of them are
used. In the bypass position (as shown on
Figure 13), the data set output is fed in at pin
5 on the orange wire, transferred to pin 4,
and fed out to the receiving distributor input
of the terminal on the yellow wire. Since pin
2 is closed to pin 6, the data output of the
SAll0 (white wire) is connected to the data
input of the SAll0 (red wire). The white-
purple wire brings +17. 5 volts from the data
Page 22
set (via the DATASPEED receiver) to pin 7,
where it joins the white- slate wire connected
to the supervisory transmitted data input of
a 202C dataset. Reverse channel, ifpresent,
is therefore held on at all times regardless
of the position of the bypass switch. (A 202A
data set, which does not have reverse chan-
nel, has no connection to the pin that the +17. 5
volts is wired to. )
(b)
When SWl is activated, the data set out-
put at pin 5 (orange wire) is transferred
to pin 6 (red wire) where it is supplied to the
data input of the SAll0. The data output of
the SAl 10 (white wire) at pin 2 is transferred
to pin 4 (yellow wire) where it is supplied to
the input of the receiving distributor. This
places the SAll0 in series with the incoming
data stream between the data set and the ter-
minal, as for the TP327640 assembly. The
low speed counter coil, D82, and the lamp,
DSl, are connected to the re lay transfer con-
tact in the SAll0. When the relay is ener-
gized, this contact permits the counter to
register the error (or error burst) and the
lamp to light. Dependingon the SAll0 strap-
ping (3. 29 and 3. 34), the lamp will flash on
each error (or error burst) or latch on for
the first error and flash off for each additional
error (or burst). For each flash (on or off)
of the lamp, the counter will register another
count. As explained in 3. 28 and 4. 02, this
count may be much less than the number of
individual errors actually detected by the
SAll0 because the time required to activate
and deactivate the counter is much longer than
the duration of a character. · The reset switch,
SW2, extinguishes the lamp when the lamp
housing is depressed; the counter is mechani-
cally reset to zero by its own pushbutton.
4. 11 The wiring for bypass switch and indi-
cator assembly TP327639, the SAll0
chassis, the terminal, and the data set is shown
in simplified form on Figure 14. Refer to 8717WD
for a complete schematic and to 8567WD for
actual wiring information.
(a} Bypass switch SWl is shown in the bypass
position on Figure 14. The wiring for it
is identical to that for bypass switch and indi-
cator assembly TP327638 (4. 10 (a)).
(b}
When SWl is activated, the data set out-
put at pin 5 (orange wire) is transferred
to pin 6 (red wire) where it is supplied to the
data input of the SAll0. The data output of
the SAl 10 (white wire) at pin 2 is transferred