Setup And Connections; Connecting The Power Supply; Connecting Bb-Mesp211T To Modbus Networks - Advantech BB-MESP211T User Manual

Modbus Gateway – BB-MESP211T

3. SETUP AND CONNECTIONS

Note: In this section, devices to be connected to the Modbus Gateway's serial connection are referred to as the "Modbus
network".

CONNECTING THE POWER SUPPLY

Connect a DC power supply to BB-MESP211T Modbus Gateway. A 12V DC, 6W power supply is included with
international AC blades.
: A 12V DC wall adapter/power supply is included with each serial server and is the preferred method to power the unit.
NOTE
NOTE: acceptable voltages are 10- 30 V DC. The power supply must be capable of supplying 4W.
BB-MESP211 Power Connection

CONNECTING BB-MESP211T TO MODBUS NETWORKS

The BB-MESP211T gateway can be configured to connect to Modbus networks using RS-232, RS-422,
RS-422 4-wire connections support two signal pairs: RXA(-), RXB(+) and TXA(-), TXB(+), 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-232 connections are also supported.RS-485
connections support 2-wire or 4-wire operation.
When configured for 4-wire operation the connection supports two signal pairs: RXA(-), RXB(+) and
TXA(-), TXB(+), 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: Data B(+) and Data A(-)
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.
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