User's Manual

CHAPTER 6
SERIAL APPLICATIONS
Revised: 9 Sep 11 6-3 EST P/N AA107A
USING THE RS-232 DATA PORT
The ESTeem 195Ea has a serial data port that can provide RS-232 communication between two or more serial
devices using the wireless broadband link. The serial data is encapsulated and transferred as a standard Ethernet
packet over an operating 195Ea wireless Ethernet system. The configuration for a serial 195Ea network will be the
same as an Ethernet or a serial (RS-232) based communication network.
The serial interface option can be used to link two or more serial devices in a new or existing system. The serial data
has very little impact on the network bandwidth and will allow for both Ethernet and serial applications simultaneously.
A possible application would be installation of the 195Ea in an existing serial based network that was looking for future
upgrade to an Ethernet based system. Another would be using the high-bandwidth Ethernet connections to provide a
link to remote video hardware while also providing a
serial link to the existing PLC in a SCADA type
application.
SERIAL CONNECTIONS
The RJ-45 serial data port is the far-left port on the
face of the 195Ea (Figure 4). Using the ESTeem
AA0621 interface cable, the 195Ea can be connected
to a standard DTE-device (PC) with a male 9-pin Sub-
D connector. The complete cable configuration is
available in Appendix C – Interface Ports.
Second Ethernet Port
Installation of the serial option also includes installing
a second 10/100 Base-T Ethernet interface. This
second Ethernet port can be used to Bridge to the first Ethernet port (ETH_0) and the wireless link working as a two-
port HUB when configured in the AP Bridge mode. This second Ethernet port can also be configured as a Router port
between the wireless and the first Ethernet port in AP Router mode (Figure 5).
AP Bridge Mode
In the AP Bridge mode, both Ethernet ports (primary and secondary) and the wireless port (WLAN_0) are configured
for a common IP subnet and share the same IP address.
AP Router Mode
In the AP Router mode, the two Ethernet ports will be on the same IP subnet, while the wireless port will be on a
separate IP subnet. If desired, the secondary Ethernet port (ETH_1) can be configured for a 3rd subnet (i.e. subnet C).
This requires advanced configuration and routing tables specific to the particular networks.
SERIAL CONFIGURATION
12 VDC Input
(Auxiliary
Connector )
Reset Switch
RS-232
Configuration
RJ-45 10/100BaseT
Ethernet Port
Transmit
LED
Receive
LED
Status
LED
Power over
Ethernet LED
Aux Power
LED
RS-232
Data Port
Second
Ethernet
Port
Figure 4: 195Ea Front Panel Overview
Bridge
Ethernet 1 Ethernet 2
Wireless
Figure 5: Bridge and Router Configuration for Ethernet Ports
Router
Wireless
Ethernet 1
Ethernet 2
Subnet 1
Subnet 2