SmartFlex SR310
When connecting counterpart terminal block connectors (included in package with the router),
use cables with nominal cross section 0.2 to 1.0 square mm (30 to 16 AWG). Recommended
stripping length is 5 mm. For M2 captive screws the screw driver 0.5 x 3 mm is recommended.
Tighten the screws with 0.3 Nm torque.
Connection of RS485 connector:
Pin
Signal
Description
Direction
1
GND
Signal ground
∗
—
2
TxRx+
RS485 B(+)
Input/Output
3
TxRx-
RS485 A(-)
Input/Output
Table 25: Connections of Terminal Block Connector RS485
∗
Signal ground is isolated from the router’s ground.
Figure 47: RS485 connector
The termination resistor can be activated directly on the port board using a jumper (termination
resistor is part of the port board).
Connection of RS232 connector:
Pin
Signal
Description
Direction
1
AUX
+5 V/500 mA
—
2
GND
Signal ground
∗
—
3
RXD
Receive Data
Input
4
TXD
Transmit Data
Output
Table 26: Connections of Terminal Block Connector RS232
∗
Common with router’s signal ground.
Figure 48: RS232 connector
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