Connecting the MESR9x1-x

B&B Electronics MESR9xx manual Connecting the MESR9x1-x

3. Setup and Connections

Vlinx MESR9xx Modbus Gateway

RS-232connections support eight signal lines plus Signal Ground. Signals are single ended and referenced to Ground. Default communications parameters are 9600, 8, N, 1 and no flow control implemented.

RS-422connections support two signal pairs: RXA(-), RXB(+) and TXA(-), TXA(+), plus GND. The data lines are differential pairs (A & B) in which the B line is positive relative to the A line in the idle (mark) state. Ground provides a common mode reference.

RS-485connections support 2-wire or 4-wire operation.

When configured for 4-wire operation the connection supports two signal pairs: RXA(-), RXB(+) and TXA(-), TXA(+), plus GND. This makes full-duplex operation possible. The data lines are differential pairs (A & B) in which the B line is positive relative to the A line in the idle (mark) state. Ground provides a common mode reference.

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.

The MESR9x1-xhas 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 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.

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 pinout information.

Page 13	Manual Documentation Number MESR9xx-4508m
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MESR9xx specifications

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