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3.6 Powering the SL-MOD-GW
Before connecting power please follow the rules in the section called "Safety Precautions" and
Section 3.3, "Before connecting anything".
Power is supplied via a 3.81 mm 2-pin pluggable terminal block located at the top side of the mounted unit
(refer to Figure 2.1, "Location of connectors"). The following table and picture shows the power terminal socket
pinout:
Pin
1
1
2
Table 3.1: Power supply connector pinout
Caution
Make sure that the polarity of the supply voltage is correct before connecting any device to
the serial ports! A wrong polarity can cause high currents on the ground plane between the
V- power supply pin and the serial port ground pins, which can cause damage to the device.
3.7 Wiring the RS-485/422 interface
The RS-485/422 port is used for integrating the SL-MOD-GW into a two-wire or four-wire Modbus over Serial
Line network. The use of either the RS-485 or RS-422 interface must be configured using the web interface
(See Section 5.3.2, "Configuring serial line Modbus"). The SL-MOD-GW is a Modbus Master device on this
interface.
The RS-485 and RS-422 signals are located at the 3.81 mm 6-pin pluggable terminal block on the top side of the
mounted unit (refer to Figure 2.1, "Location of connectors"). The following table and picture shows the pinout:
Pin
1
RS-485
1
RS-422
Table 3.2: RS-485/RS-422 connector pinout
• Line termination is required and is typically done with a 120 Ohm 1/4 W resistor. For RS-485 operation the
bus must be terminated at both ends. For RS-422 operation a termination resistor must be inserted between
the RX+/RX- signals.
• Maximum number of RS-485 nodes without repeater is 32.
UMSLMODGW-1006
Signal Function
V+
Positive voltage supply (10 - 30 V DC)
V-
Negative voltage supply, DC power return
RS-485
signal
3
GND
4
D+
5
D-
6
7
8
RS-422
Description
signal
GND
Modbus Common
TX+
Modbus D1 or TXD1
TX-
Modbus D0 or TXD0
GND
Modbus Common
RX+
Modbus RXD0
RX-
Modbus RXD1
7
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