IBM 1 Series - Page 113

Device Teletypewriter adapter
+12 V
455 2
(installed only for nonisolated
Jumper on card
Top-card connector pin
current loop interface)
AOl 180 Q
360 2
Isolated _— —T
contact __ — |
sense Receiver
a |
| Optical l
A03
, O o—e [ isolation | ’
Nonisolated @ —~
contact a _|
sense
Bol
O
O
+5
V
455.2
150 2
B04 chev
TTL O Receiver
300 2
A04
EIA —C) O Receiver
EIA or TTL BOS
signal ground —O O- @
AOS
O
\ ) Logic ground
To frame
ground strap |
Figure 4-2. Input circuits
4-8 GA34-0033