IBM Series 1 User Manual page 131

Interf.a~
__ - 1
Advantages _____
-1
J
I
1) Non-isolated I- Simple cabling from I-
current loop I card to device I
I I
J. Current loop usually I
I
is
not an added-cost I
I feature of device I
.- High noise immunity I
I-
Customer does not baveJ
I to purchase OEM power I
I supply to drive I
I current loops I
___________ 1.
I
I I
2) Isolated I- Current loop usually ••
current loop I is not an added-cost I
I feature of device
J
I- High noise immunity I-
I
I
I I
I I
I I
,- ±12 volt power featurel
I not required I
Disadvan!.~~_,
_ _ _
±12
volt power feature
is a prerequisite for
this interface
Customer must purchase
two
OE"
power supplies
to drive current loops
customer must furnish
cabling fro. the tele-
typewriter adapter to
paver supplies to
attached device
__________ 1 ..
1 _ _ , _ _ _ , _ _ _ _ _ _ _
I I
3) ErA voltage I- customer does not have • ±12
volt paver feature
is a prerequisi te for
this interface
level
J
to purchase OEM power
I supplies to drive
I
current loops
•
I
I
I-
Simple cabling from
I card to device
• EIA voltage level inter-
face is usually an added-
cost feature of device
I • EIA signals not gene-
I rated by teletypewriter
I adapter must be jumpered
I or tied up
I __ 1 __________ _
I I
4)
TTL voltage .- ±12 volt power featurel- Few OEM devices
level I is not required I offer this interface
I- Simple cabling from I
J card to device I
4-8
GA34-0033
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