27 GPRS support Page 124 of 142
MCS301 meter - product Manual 1.25 MetCom Solutions GmbH
27 GPRS support
This interface is based on IP network and SMS service. The DLMS protocol is used for
data exchange between electricity meters and HES. The HES acts as DLMS client and the
E-meter as DLMS server. The following communication services are provided:
•
GPRS
•
SMS (Wake-up)
Two operating modes are used in this interface as follows:
•
Pull or Push
The “Pull” mode is initiated by HES. It is used for collecting data from meters or sending
commands to meters and consumer’s interface. The “Pull” is using following DLMS services:
•
OPEN
•
RELEASE
•
GET or SET
•
Action
The “Push” mode is initiated by the meter to send critical information such as Alarms and so on to
the HES. The DATA-NOTIFICATION service of DLMS is used in this mode. Following table shows
the DLMS services in Pull and Push modes for IP-based or SMS communication.
Operating Mode
DLMS Services
IP Communication SMS Communication
Pull
GET, SET, ACTION (Confirmed)
SET, ACTION (Unconfirmed)
DATA-NOTIFICATION (Unconfirmed)
DATA-NOTIFICATION (Unconfirmed)
27.1 Identification and Addressing
In COSEM TCP-UDP/IP based network (in WAN level), all COSEM physical devices are identified in
system by their network IP address. This is an address in network layer of each device. There are 3
types IP addresses in each device in network for different addressing purpose. They are as follows:
• Broadcast IP Address
• Multicast IP Address
• Device Unique IP Address
27.1.1 Broadcast IP Address
The Broadcast address is an address at which all devices connected to network are enabled to
receive datagrams. A message sent to a broadcast address is typically received by all network
attached hosts. This is an all-ones rest field IP address and can be defined in each defined network.
27.1.2 Multicast IP Address
The Multicast address is an address for a group of devices in network, that are available to process
datagrams or frames intended to be multicast for a designated service. The several groups can be
defined in system according to different requirements and a multicast IP address will be assigned to
each group. The Multicast IP address of each device will be specified by Central System.
27.1.3 Device Unique IP Address
The Device Unique IP address assigned to device in network. The meter should support both of the
static and dynamic IP address types.
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