GE MDS entraNET 900, Техническое руководство

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132 MDS entraNET Technical Manual 05-4055A01, Rev. E
5.5 Point-to-Multipoint, Serial-to-Serial
Application Example
The operation and data flow for this mode is very similar to a
point-to-point serial-to-serial application, except that it uses multicast
addressing. The primary difference is that data presented at the AP
COM
port is packetized and sent to all of the Remotes. Upon receiving the
packet from all of the Remotes, the data is stripped out of the packet and
sent from the
COM
port. Likewise, data presented at any of the Remote
COM
ports is packetized, sent to the AP, stripped, and sent from the AP
COM
port.
Invisible place holder
Figure 5-17. Point-to-Multipoint Serial-to-Serial Diagram
EIA-232
Terminal
or Computer
RTU
RTU
RTU
EIA-232
EIA-232
EIA-232
192.168.0.10
192.168.0.1
C
O M 2
P W
R
L I
N K
C
O M 1
C
O M
2
P
W R
L
I N K
C
O M
1
C
O M 2
P W
R
L I
N K
C
O M 1
Access Point
Remote
Remote
Remote
L A N
C
O M 1
C O M 2
P W R
LI NK
Table 5-5. Point-to-Multipoint Serial-to-Serial Configuration
MDS entraNET radio
Location Menu Item Setting
AP (COM2) Port Status Enabled
Mode Serial-to-Serial
Remote UnitID Broadcast
Remote COM port COM2
Baud Rate 19200
Byte Format 8N1
Buffer Size 256 Bytes
Inter-Packet Delay 4
Remote radio (COM2) Mode Data
Baud 19200
Format 8N1
Buffer 256
DelayChars 4