Emerson Micro Motion Transmitters and Discrete Controllers Series 3000 Manual de usuario descargar pdf (Pagina 8)

8 Micro Motion

Series 3000 Transmitters and Controllers

Digital communications

RS-485 One pair of terminals supports SP (service port) mode or RS-485 mode. On device power-up, the

user has 10 seconds to connect in SP mode. After 10 seconds, the terminals switch to RS-485

mode. The communication parameters in SP mode are:

Protocol Modbus RTU

Data rate 38,400 baud

Parity No parity

Stop bit One stop bit

Address 111

In RS-485 mode, the Series 3000 can communicate via Modbus RTU, Modbus ASCII, or HART

(1)

protocols. The communication parameters are configurable with ProLink III software, Modbus, or

the display. The shipped default parameters are:

(1) HART protocol supports configuration of basic transmitter functionality, configuration of the petroleum measurement application, and

reading/writing batch setpoints and totals. HART protocol does not support configuration of the batch, concentration measurement, or

NOC applications. Both Modbus and the display provide configuration and control of all transmitter functionality.

Data rate 9600 baud

Parity Odd

Stop bit One stop bit

The RS-485 port can also be configured as a printer port (see below).

HART Bell 202

(1)

The HART Bell 202 signal is superimposed on the primary mA output, and is available for host

system interface or for polling external measurement devices. The HART Bell 202 communication

parameters are:

Frequency 1.2 and 2.2 KHz

Amplitude 0.8 mA peak-to-peak

Data rate 1200 baud

Resistance Loop requires 250 to 600 ohms resistance

Printer port The RS-485 port can be configured as a printer port. When the RS-485 port is

configured as a printer port, it cannot be used for any other function.

Requires external RS-232 adapter (not included)

With Epson TM-U295 ticket printer, detects and reports “paper out” conditions.

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Emerson Micro Motion Transmitters and Discrete Controllers Series 3000 Manual de usuario Pagina 8