SMAR ENET-710, Руководство пользователя

Страница: 9 / 22

ENET-710 – User’s Manual
5
Serial Port Connectors
All five serial port connections are found on five terminal block connectors on the front of the module
panel. Port P0 is located in the top position of the five port connectors, just below the RJ45 Ethernet
connector. P1 is located below P0, followed by P2, P3, and P4. For each serial port connector, pin
1 is the topmost position. Using the provided 3-position terminal block connector plugs, insert the
wires from the serial cabling into the wire openings on the plugs and secure them by tightening the
screws with a screwdriver. Then insert the plugs into the appropriate serial connector on the
module front panel making sure they are fully seated. The table below details the serial port
connections.
Terminal Block pins
Port Type Isolation
Pin 1 Pin 2 Pin 3
P0 Full-duplex RS-232C None TxD RxD Ground
P1 Half-duplex RS-485 1600V TR+ TR- Common-P1
P2 Half-duplex RS-485 1600V TR+ TR- Common-P2
P3 Half-duplex RS-485 50V TR+ TR- Common-P3
P4 Half-duplex RS-485 50V TR+ TR- Common-P4
Legend:
TxD – Data Transmission.
RxD – Data Reception.
TR+ - Positive Data Transmission/Reception.
TR- - Negative Data Transmission/Reception.
Supported Serial Protocols
The ENET-710 supports two serial communication protocols including Modbus/RTU and CD600.
Modbus/RTU and CD600 protocols are available on all five serial ports. The protocol is selectable
under the configuration menu for each serial port (see the configuration section later in this manual).
Modbus/TCP Protocol
In Modbus mode, the ENET-710 acts as a bridge between Modbus/TCP and Modbus/RTU. The
ENET-710 takes Modbus/TCP frames received on port 502 from the Ethernet connection and
creates a Modbus serial line protocol data unit by computing and appending a CRC and inserting
the device address extracted from the Modbus/TCP frame. It then sends the serial packet out the
serial port that has been configured with the specified device address. Upon receipt of data from a
Modbus compatible device over a serial port, the ENET-710 verifies the CRC on the data and, if
correct, creates a Modbus/TCP application data unit and encapsulates it into an Ethernet frame and
sends it out the Ethernet port over the appropriate socket. The ENET-710 also handles command
time-outs on the serial port network. In the case that a serial device fails to respond, the ENET-710
replies to the client with a Modbus/TCP timeout exception code. In the case of an invalid response
from a Modbus/RTU slave (including bad CRC), the ENET-710 will ignore this response and the
client must perform the error handling. The ENET-710 will also respond back to the client with a
Modbus/TCP exception code if the client tries to access a device address that does not exist in the
current ENET-710 configuration.
CD600 Protocol
In CD600 mode, clients running the CD600 Configuration software can communicate over Ethernet
to one or more CD600 Multi-Loop Controllers using the RS-485 port on the CD600. Configure the
selected ENET-710 serial port to match the serial port settings of the CD600, the CD600 device
address, and choose the CD600 serial protocol.
Configuration Web Page
The user configures the module with the configuration menu. The menu is accessed via a web page
using a web browser over the Ethernet connection. With this menu, the user can configure all five
serial ports for desired baud rate, character format, and serial protocol. Also the user sets up the
address range of devices connected to a particular serial port and device response timeouts.
Additionally, system administration settings such as the login username and password plus IP