Protocol Support; Serial Rs422/485 Interface; Figure 6 - Phoenix Connector; Table 1 - Rs422/485 Signals - GridConnect NET485 Manual

Introduction

2.2 Protocol Support

The NET485 uses the Internet Protocol (IP) for network communications and the Transmission Control
Protocol (TCP) to assure that no data is lost or duplicated and that everything sent to the connection arrives
correctly at the target.
Other supported protocols include:
ARP, UDP, TCP, ICMP, Telnet, TFTP, AutoIP, DHCP, HTTP, and SNMP for network
communications and management.
TCP, UDP, and Telnet for connections to the serial port.
TFTP for firmware and web page updates.
IP for addressing, routing, and data block handling over the network.
User Datagram Protocol (UDP) for typical datagram applications in which devices interact with
other devices without maintaining a point-to-point connection.

2.3 Serial RS422/485 Interface

The table below lists the RS422/485 signals for the NET485. The RS422/485 and power interface is a 7-pin
removable Phoenix connector, with two of the pins used for power.

Table 1 - RS422/485 Signals

NET485 Signal
TXDA
TXDB
RXDA
RXDB
SGND
GND
8-24VDC
RX TERM
TX TERM
TXDA
TXDB
RXDA
RXDB
SGND
GND
8-24VDC

Figure 6 - Phoenix Connector

The NET485 uses protective clamping structures on its inputs and outputs that clamp the voltage to a safe
level and dissipate the energy present in ESD (electrostatic) and EFT (electrical fast transients) discharges.
This protection structure achieves ESD protection up to 8 kV according to IEC1000-4-2, and EFT protection
up to 2 kV on all input/output (I/O) lines.
The NET485 has jumper terminals for adding termination resistors to the RX and TX lines. Add these
jumpers ONLY if you have long transmission lines and termination resistors are needed.
WARNING: Jumpers must be installed vertically.
Note: Do NOT use RX Term and TX Term jumpers on short transmission lines. Remove these jumpers to remove the
120 Ohm resistors from the transmit and receive lines.
Note: See the Application Notes on the product CD for more information about networks and termination procedures.
2-2
7-Pin Phoenix
7
6
5
4
3
2
1
Termination Jumpers
NET485 User Guide