B&B Electronics MESR901 Especificaciones descargar pdf (Pagina 16)

3. Setup and Connections Vlinx MESR9xx Modbus Gateway

Page 12 Manual Documentation Number MESR9xx-0712m

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When configured for 2-wire operation the connection supports one signal pair: DataB(+)

and DataA(-) signal channels using half-duplex operation. The data lines are differential

with the Data B line positive relative to Data A in the idle (mark) state. Ground provides

a common mode reference.

Connecting the MESR9x1-x

The MESR9x1-x has one serial connection that supports RS-232, RS-422 and RS-485

(2- and 4-wire). The unit has two connectors: a DB-9M connector and a 5-position

terminal block.

If you select RS-232 mode when you configure the Modbus gateway, you must connect

the Modbus serial network to the Modbus gateway via a serial cable. The MESR901 is a

DTE. If the Modbus network is a DTE, use a null modem (cross-over) cable. If the

Modbus network is a DCE, use a straight-through cable. DTE and DCT ports are

complementary, the Output signals on a DTE port are Inputs to a DCE port, and Output

signals on a DCE port are Inputs to a DTE port. The signal names match each other and

connect pin for pin. Signal flow is in the direction of the arrows. (see figure below)

If you select RS-422 mode, RS-485 2-wire mode, or RS-485 4-wire mode when you

configure the Modbus gateway, you must connect the Modbus network appropriately, via

the 5-position terminal block.

Note: Refer to Appendix D for connector pin out information.

Figure 13. MESR901 Connections

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