3704-IG-001 Installation and User Manual
Page 2
Communication Options
There are two communication options available for facilitating communication between the EVSE and payment or gateway
systems:
Serial Connection
A serial connection can be established between one or more 3704 EVSEs and a Payment Module or Gateway. A single serial
Payment Module or Gateway can support from one to eight EVSEs, depending upon its configuration.
ZigBee Connection
The 3704 will also communicate to a Gateway or Payment Module using the ZigBee Mesh protocol, allowing wireless
connections. ZigBee networks are secured by 128-bit symmetric encryption keys, so security is assured. A single ZigBee
Payment Module or Gateway can support up to 32 remote EVSEs.
Pole-Mounted Connection
When the 3704 EVSE(s) and the 3725-104 Payment Module are mounted together on a pole, typically, an internal serial cable
connects each EVSE to the Payment Module. The Payment Module then connects to an external network via a Cellular
modem or a hard-wired Ethernet connection. The Cellular modem securely transmits encrypted payment data to and
receives authorizations from external PCI-compliant processors. Communication can also link the EVSE network with third-
party network management providers for reporting and call center support.
Wall-Mounted Connection
A configuration where it is most convenient to wall-mount the 3704 EVSEs typically means the 3725-104 Payment Module is
also wall-mounted nearby. Like the pole-mounted option, connection of EVSE(s) and Payment Module is made using either
serial-cable connections, or a ZigBee Mesh network.
The Payment Module in this configuration operates identically to that described above for the pole mounted unit.
Remote Connection
Remote connections between 3704 EVSEs and a Payment Module can be made, typically using a ZigBee Mesh network. This
allows the EVSEs and Payment Module to be located a greater distance from each other, and also a greater number of EVSEs
to work with a single Payment Module. (See chart below).
EVSE to Payment Module Connection
EVSE to Payment Module Distance
EVSEs per Payment
Module
Serial
Cable length should be no more than 180 feet from
any EVSE to the Payment Module
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ZigBee Mesh Network
Cable Length
Indoors: 30 – 65 feet (Depending on walls to
penetrate.)
Outdoors: Up to 4800 feet (Line-of-sight,
depending on signal strength and
environmental conditions.)
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NOTE: Administrative data can be transmitted to a remote laptop computer (via the Gateway with a ZigBee Mesh network
option only) without accessing an external network.
