IBM Series 1 User Manual page 243

TNL: GN34-0368 to GA34-0033-0 (February 4, 1977)
Note that two different wrap connectors may be required at
the customer device cable connector. These two different
wraps are (1) Request to Send to Clear to Send, and (2) Data
Terminal Ready to Data Set Ready. Connector pin A7 is EIA
data terminal ready, and is a logical one when power is on
in the teletypewriter adapter.
This interface requires a shielded 3-conductor cable,
4-conductor
if
the EIA transmitted data signal is used.
!I1.
The connections for TTL are as follows:
Series/l TTY card connector
B4 TTL received data
85 Signal ground
§.ith.2£
A7 SSS closed=data mark or
-TTL data out
B7 SSS open=data mark or
+TTL data out
Device connector
TTL transmitted data
Signal ground
TTL received data
Wire the cable to (~ither pin A7 or pin 37, depending on
which polarity for received data is required by the attached
device.
The interface requires a shielded 3-conductor cable.
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.. Connect. ions for
this current loop are as follows:
Series/l TTY card connector
A1
Isolated receive input+
A3 Isolated receive input-
85 Signal ground (Transmit-)
A7 SSS closed=data mark
Device connector
'I'ransmit -
Transmit
+
Receive
+
Receive -
Two external power supplies are required for the current
loop interface. One for the transmit loop and one for the
receive loop. Both power supplies must generate 25-volt
power and must supply a cuerent of up to 100
mAe
The two external power supplies must be placed in
series with the transmit and receive loops with the
polarities shown above. It is recommended that the power
supplies be placed at the device end of the cable.
Figure 4-9 is a diagram for the cable connections just
described; that is, when the customer elects to use: (1)
external power supplies, (2) solid state switch
teletypewriter adapter outputs, and (3) is 01 a
t_e.d
receive
inputs.
!21g. For this configuration, the jumper wire that ties +12
volts into the receiver logic should
B21
be used (refer to
Figures 4-5 and 4-7).
4-30
GA34-0033
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