Thermo Scientific LevelPRO Series, Руководство по установке

Страница: 36 / 111

Wiring
HART Communications
4-8
LevelPRO Installation Guide Thermo Fisher Scientific
The serial port on a PC (COM1 or COM2) can be connected directly to
the RS232 port on the gauge. This requires five wires: ground, transmit
(TX), receive (RX), request-to-send (RTS), and clear-to-send (CTS). The
connections between the RS232 port (J3 on the CPU board) and the PC
serial port are summarized in the table below for standard DB9 and DB25
PC serial port connectors.
Table 4–1.
J3 on CPU Board PC Serial Port DB9
Connector
PC Serial Port DB25
Connector
J3-2 (RX) Pin 3 Pin 2
J3-3 (TX) Pin 2 Pin 3
J3-4 (RTS) Pin 8 Pin 5
J3-5 (CTS) Pin 7 Pin 4
J3-6 (GND) Pin 5 Pin 7
To communicate with the gauge from a PC requires that the PC be
running a terminal emulation software. The default communication
settings for the gauge’s RS485 and RS232 ports and for the HHT are: 7
data bits, Even parity, 1 stop bit, 9600 baud.
Refer to the LevelPRO user guide for additional details about setting up
and using serial communications.
The HART

communication protocol is supported over the 4–20 mA
current output with the HART interface board. The HART interface
board is an optional daughter board that is wired via a cable to J6 on the
CPU board. Communication with the gauge is via the 275 or 375 Field
Communicator from Emerson Electric Co. Refer to the LevelPRO HART
operation manual (p/n 717817) for detailed instructions.
Note
HART communication protocol allows you to configure and
calibrate the gauge in most applications; however, due to limitations of the
protocol, the complete range of functions is only available when using the
Thermo Scientific Model 9734 handheld terminal and the RS485 port.

RS232 Wiring
Using Serial
Communications
HART
Communications