ascon S2 Series - Page 63

Appendix A - Communication Ports Configuration
55
A-3 Configuring the Modbus Connections
A-3-1 Configuring the X1 Modbus Port
The X1 Port can be used for Modbus communications. The RJ45 RS485 Modbus
Port connector is located in the upper side (on the left) of the CPU. Looking at the
hole of the plug the 8 contacts are arranged as illustrated in the drawing.
The signals present at the RJ45 connector of the
Service Port are:
Some parameters of the Modbus Port can be configured using selectors 1...3 of
the microswitch block. Please note that the ON/OFF position of the microswitches
is pointed out by an arrow printed on the selectors block.
The following table describes the possible options.
The default communication parameters for the X1 port are:
- Baud Rate: 9600 bps;
- Data: 8 bit;
- Stop bit: 1;
- Parity: none;
- Flow Control: none.

WARNING
The default communication parameters can be set only using the specific Function
Block. See “
Ascon Firmware Function Block Library [3]” for details.
Pin
Signal
1D+ (RS485)
2 D- (RS485)
3 GND (RS485)
4NC
5NC
6NC
7NC
8NC
Selector ON OFF
1
Termination resistance (ON/OFF)
(110Ω) (default disabled = OFF)
2
Line polarization Pull-Down (ON/OFF)
(default disabled = OFF)
3
Line polarization Pull-Up(ON/OFF)
(default disabled = OFF)
Front side
of the CPU
Female RJ45
RS485 Modbu
s
port connector
Upper side
X0 X1