Communications

The WTT662.. network node receives telegrams in S-mode and C-mode and forwards them on the mesh network.

  • Consumption measuring devices in S-mode:
    • Mixed network with WTT662-BA1100, WTx16, and WTT561-AA1100
    • Read out using gateways WTX16.IP, WTX16.GSM or WTT563.., WTT667.., WTT568..
  • Consumption measuring devices in mixed operation S-mode and C-mode or in C-mode only:
    • The firmware on all WTT561.. on the network must be updated to WTT662 functionality.
    • Network nodes WTx16 must be replaced by WTT662...
    • Read out with WTT563.., WTT667.., WTT568..

Up to 12 network nodes can communicate with each other on a network and exchange the respective consumption data (mesh system). This way, up to 500 heat cost allocators and/or wireless heat/water meters can be incorporated in a radio network (manages 500 addresses). This means that each individual network node stores all consumption data for the entire network.

Data security

An individual log in and password secures each network from unauthorized access. AES128-encrypted measuring devices (WFx6.. / WHE54.. / WHE6.. / WFZ66..) in C-Mode can be read out by the network nodes.

M-bus interface

The network nodes are equipped with a M-bus interface that can be integrated in a wired M-bus system. The interface can also be used simultaneously to read out data locally or configure the network on site.

USB adapter interface

The network node has an 8-pole socket to plug in USB adapter RNNPH0010020. The network can be read out locally over this adapter; the adapter can also be used to upload firmware updates to the network node.

IrDA interface

The IrDA interface can be used to teach in or out individual meters or – if there is a need to replace a complete network node – all data of the former network node can be transferred to the new node. In both cases, tools or extra software are not required.

Limitations

Combined heat/cooling energy meters can have one ID number each for heat and cooling energy. In this case, the network node treats the combined meter like 2 autonomous meters.

NOTICE

Wireless meters sending the telegrams in C-mode do not send historical values (monthly value / Exception: Prior month's value). The monthly values can be formed in the portal (Siemens gateway configuration portal) or in the invoicing software.

The network node stores the monthly values for S-mode devices as static values (max. 18 months).

Modes

The following modes are available, among others:

  • Protected installation mode: Only those devices recognized as belonging to the system are integrated on the network.
  • Copy mode: Data (Device list / user list / statistic values) of a node already on the network are transferred to a new node.
  • Delete mode: Exchanged devices are deleted from the plant list.
  • IrDA learn and delete function: New devices are added to or deleted from a plant. The devices are synchronized.

Additional information on modes is available in the Commissioning and User's Guide, document A6V11762785. See Product documentation.