CH Tech EM405D - Manual (Page 18)

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RECOMMENDATION
The EM405D is an embedded device without an input device or display
that can be used to determine the current configuration of the device. This
can cause difficulties in determining at what IP address to access the
module. For this reason, it is highly recommended, but not required, that
the EM405D be configured to use a static IP address.
4.2.2 Subnet Mask
The subnet mask defines the number of bits that are taken from the IP address to refer to the
given network subsection. The subnet mask allows Ethernet based networks to be separated into
various subnets. The EM405D should be in the same subnet as the controlling PC.
The default subnet mask is: 255.255.255.0
4.2.3 Gateway
The gateway address allows the EM405D to communicate with other network segments. If
communication outside of the given network segment is necessary, the gateway address should
be set to the IP address of the router connecting the local network segment to the outside world.
The gateway address, if needed, must be within the local network.
The default gateway address is: 0.0.0.0
4.2.4 Port Numbers
Every TCP connection to the device is defined by a destination IP address and a port number.
The port number must be known by the software to communicate with the module. The port
number is configurable but it is rarely, if ever, necessary to change it from its default setting.
Port 9999 is reserved for Telnet access to the EM405D’s configuration utility.
The default port number for standard module access is: 10001
4.2.5 Wireless Settings
Wireless EM405D’s have other settings that must be configured for the carrier to work on a
wireless network.
Network Mode: A wireless network can operate in one of two modes, infrastructure or ad-hoc.
In infrastructure mode, all wireless network traffic passes through an access point. An access
point can be a bridge, a router, or a combination bridge + router device. The access point may
handle data encryption, bridging to wired networks, assigning IP addresses via DHCP, or a host