Siemens VersiCharge AC Quick Start Installation Manual page 11

STEP 7 Connect ModBus
RS485 - Commercial
Units Only (Figure 9)
STEP 8A Set ModBus Parent
Termination Switch
- Commercial Units
Only (Figure 10)
STEP 8B Set ModBus Child
Termination Switch
- Commercial Child
Units Only (Figure 11)
NOTE: The Multi-Use connector should NOT be on the Modbus cable when it is pushed through the rubberized gland. This
gland will not self-seal if the connector is pushed through the rubberized gland and the NEMA 4 rating will be lost.
1. Using the supplied Multi-Use connector gently press the connector into place.
2. Push the external ModBus cable through the rubberized gland at the back of the charger (this will self-seal). Attach the
external wires to the internal wire connector.
3. Gently tuck the wiring into the space and secure the back of the charger.
4. Download/install QModMaster (https://sourceforge.net/projects/qmodmaster/) or any other third-party software to test
registers.
NOTE:
1. For more information see the ModBus Manual and the ModBus Communications Setup in the VersiCharge AC Series
Install and Operations Manual at usa.siemens.com/versicharge.
2. Security: The ModBus RTU is an open protocol, and it is the responsibility of the installer to ensure the security of the
wiring of these connections to prevent tampering.
SW3-1 (left side) labelled RS485 is the Termination switch. This switch should be in the ON position for the Parent unit or in
the OFF position for a Child unit, unless that Child is the last Child in the daisy chain, then it must be ON.
NOTE: For more detail on the ModBus and the Termination Switch position settings, refer to the complete VersiCharge AC
Series Installation and Operations Manual and the VersiCharge ModBus Manual at usa.siemens.com/versicharge.
SW3-2 (right side) labelled RS485 Term is the Termination switch. For the child units the Termination switch must be set to
OFF, unless the unit is the last one in the daisy chain, then the switch must be set to ON.
NOTE: For more detail on the ModBus and the Termination Switch position settings, refer to the complete VersiCharge AC
Series Installation and Operation Manual at usa.siemens.com/versicharge.
VersiCharge™ AC Electric vehicle charging station
12