Manual

6
Input Wiring
Balanced Connection
Use this wiring when the external equipment supplies a balanced, 3-wire signal.
Connect the shield wire of the external signal to the ground terminal of the external equipment
and to the ground terminal of the RIO1S. If the "+" signal lead can be identified, connect it to the
plus "+" terminal of the RIO1S. If the external equipment polarity cannot be identified, connect
either of the hot leads to the plus "+" terminal. Connect the remaining lead to the minus "-" ter-
minal of the RIO1S.
Note: If polarity of the output signal versus the input signal is important, it may be necessary to
reverse input lead connections.
Unbalanced Connection
When the external device provides only an unbalanced connection (signal and ground), the RIO1S
module should be wired with the "-" terminal shorted to ground. The unbalanced signal's shield
wire is connected to the input module’s ground and the signal hot wire is connected to the "+"
terminal. Since unbalanced connections do not provide the same amount of noise immunity that a
balanced connection does, the connection distances should be made as short as possible.