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6 Electrical Connection
2. Connect the insulated connectors to the terminal block of the RS485 module A31 according to the following
configuration. Pretension the springs of the spring-cage terminals with a screwdriver if stranded wires are used
(see Section 6.10.2, page 56).
Conductor option
2 conductors
4 conductors
3. Terminate the RS485 communication bus. To do this, set the dip switches of the RS485 module A31 according to
the following configuration.
Conductor option
2 conductors without ter-
mination
2 conductors with termina-
tion
4 conductors without ter-
mination
4 conductors with termina-
tion
4. Ensure that the insulated conductors are firmly in place.
52
PPM-10-IA-en-16
Connection of terminal block
Tx+(B)
Tx-(A)
Rx+(B)(Data+)
Rx-(A)(Data-)
RTS+(B)
RTS-(A)
CTS+(B)
CTS-(A)
SGND
Tx+(B)
Tx-(A)
Rx+(B)(Data+)
Rx-(A)(Data-)
RTS+(B)
RTS-(A)
CTS+(B)
CTS-(A)
SGND
DIP switch 1
Off
Off
Off
Off
Connection of RS485 device
-
-
Data+
Data-
-
-
-
-
SGND
Rx+
Rx-
Data+
Data-
-
-
-
-
SGND
DIP switch 2
Off
Off
On
On
SMA Solar Technology AG
DIP switch 3
Off
On
Off
On
Installation Manual
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