IBM Series 1 User Manual page 142

Figure 4-5. Input circuits
C
Device
¢
I
I
I
I
To~card
connector pin
I
I
Isolated
r~i
contact
I
sense
I
A03
I
Non-isolated
{
I
contact
C
sense
BOlO
I
I
I
TTL
B04
0
I
I
I
I
EIA
A04
0
I
I
EIA or TTL
B05
0
I
signal ground
1
A05
0
I
I
0
~
I
To frame
I
ground strap
Q
0
Teletypewriter adapter
+12 V
180
n.
Jumper on card
(installed only for nonisolated
current loop interface)
--
--I
360
n.
-- I
.___--'----1
Receiver
455
n.
-12 V
I
~
I
Optical
isolation
--- ----J
+5 V
150
n.
300
n.
Teletypewriter Adapter
Receiver
Receiver
Logic ground
4-19