Rs232 Port; Rs485 Port - Logic IO RTCU LX5 eco Technical Manual

RTCU LX5 eco Technical Manual V1.00
Advanced Industrial M2M/IoT Gateway

RS232 port

This port can be used as a general-purpose RS232 serial port with no hardware handshake signals.
RJ45 connector overview.
Pin Name
1 RS232 TXD
2 RS232 RXD
4 GND

RS485 Port

RS485 is a multi-drop network with a maximum of 32 nodes connected simultaneously to the bus.
The RS485 bus contains an RSA and an RSB signal and a signal ground, which must always be
connected to the common signal ground for all nodes connected to the RS485 bus!
The maximum cable length for the RS485 bus is according to the EIA/TIA-485-A standard (max.
1000m @ <100kbit); this limit is highly influenced by the quality of the cable, signaling rate, noise
etc.
At longer cable lengths, noisy environments, or high communication speeds, it might be necessary
to terminate the transmission line with a 120
terminate it and avoid signal reflections. If the RTCU LX5 eco is used as an endpoint node, the
jumper for the RS485 port can be inserted in order to terminate the RS485 communication lines
with 120Ω. By default, the RS485 communication lines are not terminated with 120 Ω.
Please note: For best performance, protection, and noise immunity, it is advised to use a shielded
cable to connect the device to the RS485 communications bus.
RJ45 connector overview
Pin Name
3 RSA
6 RSB
8 GND
1 Assuming use of a CAT5 twisted pair cable
Logic IO ApS.
Holmboes Allé 14
8700 Horsens
Denmark
Description
Transmit Data from serial port, RS232 compatible
Receive Data for serial port, RS232 compatible
Signal Ground
ohm resistor at each end of the transmission line to
1
Description
RS485 non-inverting signal for RS485 port
RS485 inverting signal for RS485 port
Signal ground
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