Cal Amp VIPER SC+ 100 series User Manual - page 27
Viper SC+™ IP Router for Licensed Spectrum PN 001-5008-000 Rev. C
| Page 17
Ethernet Subnet Mask Varies from Viper to Viper.
RF Subnet Mask is the same for all units: 255.0.0.0 (hence /8 shown for all RF IP Addresses; 8 ones (24 zeros) binary.)
HMI/PLC/RTU Default Gateway points to the Viper that the HMI/PLC/RTU is connected to.
Viper #1:
Ethernet IP Address: 192.168.205.1/24
RF IP Address:
10.11.12.25/8
PLC #1:
192.168.205.2/24
Default Gateway: 192.168.205.1
Computer/HMI #1: 192.168.205.3/24
Default Gateway: 192.168.205.1
Viper #2:
Ethernet IP Address: 192.168.206.1/24
RF IP Address:
10.9.7.251/8
PLC #2:
192.168.206.2/24
Default Gateway
192.168.206.1
Viper #3:
Ethernet IP Address: 192.168.207.1/24
RF IP Address:
10.8.0.52/8
PLC #3:
192.168.207.2/24
Default Gateway: 192.168.207.1
Computer #3:
192.168.207.3/24
Default Gateway: 192.168.207.1
Viper #4:
Ethernet IP Address: 172.21.51.105/16
RF IP Address:
10.0.1. 11/8
PLC #4:
172.21.51.106/16
Default Gateway
172.21.51.106
Figure 9 – Router Mode Example 1
Router Mode Example 2
Each Viper has an Ethernet IP address on a unique network.
In this example, each network connected to the Viper’s local Ethernet port has 14 valid IP addresses that may be used
for the Viper, PLCs, RTUs, computers, or other Ethernet equipment that may be connected.
The subnet mask of the RF IP addresses has been changed to ensure that the RF IP network does not overlap any of the
Ethernet networks. In this scenario, the RF IP addresses must be manually programmed to ensure that every Viper has
an RF IP address in the network and that no RF IP address is used twice.