Instructions

Intesis

Modbus Server – M-Bus User Manual r1.4 EN

This information is subject to change without notice

URL https://www.intesis.com

12 / 20

4 Connections

Find below information regarding the Intesis connections available.

Power Supply

Must use NEC Class 2 or Limited Power Source (LPS) and SELV

rated power supply. Respect polarity applied of terminals (+) and

(-). Be sure the voltage applied is within the range admitted (check

table below). The power supply can be connected to earth but only

through the negative terminal, never through the positive terminal.

Ethernet / Modbus TCP

Connect the cable coming from the IP network to the connector

ETH of the gateway. Use an Ethernet CAT5 cable. If

communicating through the LAN of the building, contact the

network administrator and make sure traffic on the port used is

allowed through all the LAN path (check the gateway user manual

for more information). With factory settings, after powering up the

gateway, DHCP will be enabled for 30 seconds. After that time, if

no IP is provided by a DHCP server, the default IP

192.168.100.246 will be set.

PortA / MBUS

Connect the MBUS bus to connectors A3 (+) and A4 (-) of

gateway’s PortA. Intesis provides 36VDC M-Bus voltage to the

bus.

PortB / Modbus RTU

Connect the EIA485 bus to connectors B2 (+), B1 (-) and A1 or A2 (SNGD) or to connectors B1 (-), B2 (+) and B3

(SNGD) of gateway’s PortB. Respect the polarity.

Note for PortB; Remember the characteristics of the standard EIA485 bus: maximum distance of 1200 meters,

maximum 32 devices connected to the bus, and in each end of the bus it must be a termination resistor of 120 Ω.

The gateway has an internal bus biasing circuit that incorporates the termination resistor. If you install the gateway

in one of the ends of the bus, then do not install an additional termination resistor in that end.

Connect the serial cable EIA232 coming from the external serial device to the EIA232 connector of gateway’s PortB.

This is a DB9 male (DTE) connector in which only the lines TX, RX and GND are used. Details of the pinout can be

seen in the user's manual. Respect the maximum distance of 15 meters.

Console Port

Connect a mini-type B USB cable from your computer to the gateway to allow communication between the

Configuration Software and the gateway. Remember that Ethernet connection is also allowed. Check the user manual

for more information.

USB

Connect a USB storage device (not a HDD) if required. Check the user manual for more information.

Ensure proper space for all connectors when mounted (see section 7).