SMA PPM-10 - Page 52

6 Electrical Connection
SMA Solar Technology AG
Installation ManualPPM-10-IA-en-1652
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 Connection of terminal block Connection of RS485 device
2 conductors Tx+(B) -
Tx-(A) -
Rx+(B)(Data+) Data+
Rx-(A)(Data-) Data-
RTS+(B) -
RTS-(A) -
CTS+(B) -
CTS-(A) -
SGND SGND
4 conductors Tx+(B) Rx+
Tx-(A) Rx-
Rx+(B)(Data+) Data+
Rx-(A)(Data-) Data-
RTS+(B) -
RTS-(A) -
CTS+(B) -
CTS-(A) -
SGND SGND
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 DIP switch 1 DIP switch 2 DIP switch 3
2 conductors without ter-
mination
Off Off Off
2 conductors with termina-
tion
Off Off On
4 conductors without ter-
mination
Off On Off
4 conductors with termina-
tion
Off On On
4. Ensure that the insulated conductors are firmly in place.