Programming instructions
INFORMATION COLLECTOR (LOCATION 2H8-25)
The information collecting sequence begins with an iot pulse from the
Device Selector applied to the strobe input of the Information Collector.
The IC then ANDs with the input device information present level and the
results are transmitted to the AC. The results of the AND functions are
mixed, or ORed together, to enable eight 18-bit-word devices to read data
into the AC. Two or more devices requiring less than 18 bits could share
a word, provided their bit-position requirements did not conflict. In such
cases, more than eight input devices could be handled by the IC. The
incoming information signal polarities are:
0 volts
I
0 bit transmitted to AC
-3 volts 1 bit transmitted to AC
The IC consists of 18 modules, one for each bit of the word, starting with
bit 0 in module 2H8. All eight input channels are wired to each module.
The
convention
for designating bits is ICj,k, where j specifies the bit number
and k the channel number. The eight input-level terminals and associated
iot-pulse terminals are:
Channel Data-Bit Associated
(k)
Input
iot Input
0
E
F
1 H J
2 K
L
3 M N
4 S T
5 U V
6 W X
7 Y Z
INFORMATION DISTRIBUTOR (LOCATION 2Hl-3)
The Information Distributor presents the static data contained in the AC
to an output device when the Device Selector commands the device to
sample the ID. The signal polarities are:
-3 volts
I
AC bit contains a 0
0 volts AC bit contains a 1
Eight groups of 18 outputs are available in the ID. The module driving the
output bus is a Type 1690 or 1685 Bus Driver supplying up to 15 ma at
0 or -3 volts. All eight groups must share the bus.
Connections to the ID are made at three taper-pin terminal blocks, 2H1,
2H2, 2H3. Each block has 3 columns of 20 terminals each. Each column
represents a group; the first 18 terminals (A-U) in the column represent
AC bits O-17 and the last two (V, W) the bipolar bit 12 in the Memory Buffer.
V and W may be used to select a subdevice. The terminals are tied together
horizontally to form 20 rows.
54