DATA-LINC GROUP
20
PN 161-09990-002C
rev 3/29/04
SRM6200E-SLC User’s Guide
SubNet ID
The SRM6200E-SLC series modems offer a SubNet ID system for use in multi-point networks using Network ID. This feature
allows the users to dictate what path a given repeater or remote will use to achieve a link to the network Master. For
example, if a remote modem in a given network has line of sight to the network Master and one or more repeaters, but only
one repeater is close to that Remote, SubNet ID can be used to link that Master with the proper Repeater only.
Note: This feature can only be used in networks using Network ID with one or more repeaters.
There are two components to SubNet ID. The first is the Xmit (transmit) SubNet ID, and the second is Rcv (receive) SubNet
ID. The Xmit SubNet ID is used only by repeaters and is the ID that a repeater sends out when sending data to other
repeaters or remotes. The Rcv SubNet ID is the ID that repeaters or remotes look for to receive data.
Note: The master is not affected by these settings. Only repeaters and remotes use these settings. Remotes only
use Rcv SubNet ID.
Modem configurations are as follows (see diagram 1 below):
Master
No setting used
Repeaters
Any repeater that should be linked directly to the Master should have the Rcv SubNet ID set to 0. Any
repeater using another repeater as its link, needs the Rcv SubNet ID set to the Xmit SubNet ID of that
Repeater. The Xmit SubNet ID can be set to anything from 1 to E.
Remotes
Any remote that should be linked directly to the Master should have the Rcv SubNet ID set to 0. Any
remote using a repeater as its link should have the Rcv SubNet ID set to the Xmit SubNet ID of that
Repeater.
Diagram 1
Rcv = 0
Xmit not set
Remote 1
LAN
Link
In
Out
Coll
RF
Power
Link
Out
In
Power
Ethernet Radio Modem
Reset/
Confg
+V
-V
10 to 28 VDC
10BaseT
Use A or B for Lan Link
Radio Configuration
OE
A
B
LAN
Link
In
Out
Coll
RF
Power
Link
Out
In
Power
Ethernet Radio Modem
Reset/
Confg
+V
-V
10 to 28 VDC
10BaseT
Use A or B for Lan Link
Radio Configuration
OE
A
B
LAN
Link
In
Out
Coll
RF
Power
Link
Out
In
Power
Ethernet Radio Modem
Reset/
Confg
+V
-V
10 to 28 VDC
10BaseT
Use A or B for Lan Link
Radio Configuration
OE
A
B
LAN
Link
In
Out
Coll
RF
Power
Link
Out
In
Power
Ethernet Radio Modem
Reset/
Confg
+V
-V
10 to 28 VDC
10BaseT
Use A or B for Lan Link
Radio Configuration
OE
A
B
LAN
Link
In
Out
Coll
RF
Power
Link
Out
In
Power
Ethernet Radio Modem
Reset/
Confg
+V
-V
10 to 28 VDC
10BaseT
Use A or B for Lan Link
Radio Configuration
OE
A
B
LAN
Link
In
Out
Coll
RF
Power
Link
Out
In
Power
Ethernet Radio Modem
Reset/
Confg
+V
-V
10 to 28 VDC
10BaseT
Use A or B for Lan Link
Radio Configuration
OE
A
B
LAN
Link
In
Out
Coll
RF
Power
Link
Out
In
Power
Ethernet Radio Modem
Reset/
Confg
+V
-V
10 to 28 VDC
10BaseT
Use A or B for Lan Link
Radio Configuration
OE
A
B
Xmit/Rcv not set
Rcv = 0
Xmit =1
Rcv = 1
Xmit =2
Rcv not set
Xmit not set
Rcv = 2
Xmit not set
Rcv = 1
Xmit not set
Repeater 1
Remote 4
Repeater 2
Master
Remote 2
Remote 3
