SEM88_Presentation

SEM88 – 8 Port Serial Switch Company: Initra d.o.o.Milan Cunjak, Luka Penger - 2013

Hardware and software (Console, Ethernet, Computers, Sensors, Serial, SSH, Switch)

LUKA PENGER 2013 �1

SSH Console Serial Switch with Environmental Monitoring

8-port SSH Console Serial Switch with AC power. Connect up to 8 devices with different baud rates, parity, and character length. Supports two environment monitoring sensors.

The device is designed to transmit serial communication and monitoring of climate change (by temperature).The device is built to meet the needs management following communication interfaces LAN, USB, RS232 and serialMultiprotocol Transceiver (RS232 / RS422 / RS485)For the purpose of transmission of serial information is built-in 8 Multiprotocol transceivers.The device is built for 4 sensor connector. Said sensor connectors have one GPIO input and output.Power plants can be AC 230V and DC-48V.

The device is built with ARM technology (LPC1769).Management interfaces are connected directly to the communication interfaces of the CPU itself.

To connect the serial communication is used RJ45 connectors.The connection is according to EIA-561 Interface (RS232 / RJ45)8 Serial communication interface coupled via I2C0 and I2C1 bus to the CPU. In the mentioned bus is coupled p 4 I2C UART (SC16IS752).Interrupts from individual UART ICs are connected directly to the CPU.


Electrical serial connector type is controlled via the GPIO connections UART IC.Via these connections are made, the following controls:1st Choice between voltage (RS232) and current (RS422 and RS485) port (control signal to 232-1 232-8)2nd choice between semi-duplex (RS485) and Full-duplex interface (RS422)The control signals 422-1 to 422-83 Check the reception and submission of the RS485 communication is carried out via the CTS connector on the UART.4 termination of the current terminals is carried out via the THER-1 to THER-eighth.

LED Indication of serial communication is connected to the TTL connections Multiprotocol transceivers. In addition, LED status indications intended for serial communication is built-in LED indicator set electric interface type (voltage or current).

For the purposes of measurement of temperature and humidity are used I2C sensors SI7005.

Control of the sensors is carried out through the CPU bus I2C2.In the guide is connected to the I2C MUX PCA9548APW. From said MUXa the ports P0-P3 are connected to the RJ45 connectors. Port P4 is intended for the sensor which is situated on the PCB apparatus (for testing purposes).

Check the power supply of sensors is carried out via the I2C2 bus.Turning on each adapter itself and control is implemented through U8 (PCA9554A).The control circuit of each power section are two double AP2152 (U30 and U33).LED status indication of each sensor connector is conducted through U7 (PCA9555DBQ) which is connected at I2C2 guide.For each sensor an RJ45 connector is intended by four LEDs for indicating status.

In addition to the I2C bus, power supply to the sensor connectors are connected to one GPIO inputs and outputs.

PCB Version 1





PCB Version 2




For control SFP interfaces is provided I2C switch U37 which is controlled via the I2C2 CPU bus.

GSM Module

For the purposes of connection of the GSM module (or any other) is provided connector.At this terminal is present power and UART33 control connector connected to the CPU.


For UART 1 – 4 and control of the physical interface is used I2C0 and 5 – 8 UART and control the physical interface is used I2C1.Interrupt information from a single IC are routed to the CPU, from the CPU to carry out RESET all UART chip.


RS485 Control

Switching on the award RS485 transmission work MAX3160 is implemented through RTS control line. When we want to broadcast data from the UART RTS pin is placed at a high level, the data and after sending RTSpin placed at a low level (in this case, the MAX3160 Switched at reception). The data which are sent from the UART circuit in Mode RS485 connector present on the RX UART. This allows us to communicate with RS485 I run LOOP test.


Data bits (default=8): This field configures the data bits parameter. Note: If data bits is set to 5 bits, stop bits will automatically be set to 2 bits.Stop bits (default=1): This field configures the stop bits parameter. Note: If data bits is set to 5 bits, stop bits will automatically be set to 1.5 bits.Parity (default=None): This field configures the parity parameter.Flow control (default=RTS/CTS): This field configures the flow control type.FIFO (default=Enable): This field enables or disables the 128-byte FIFO buffer. The NPort 6000 provides FIFO buffers for each serial port, for both the Tx and Rx signals. Note, however, that you should disable the port’s FIFO setting if the attached serial device does not have a FIFO buffer of its own. This is because a serial device that does not have its own buffer may not be able to keep up with data sent from the NPort’s FIFO buffer.Interface (default=RS-232): You may configure the serial interface to RS-232, RS-422, RS-485 2-wire, or RS-485 4-wire.


Temperature Status

The Temperature Status graph displays a blinking error whenever temperature exceeds the low or high threshold. The CDU will continue to display this state until the condition changes or the problem has been resolved.For the temperature sensor, the default range of low/high temperature values is 5º-45º C (41º-115º F).Up to four sets of dual temperature/humidity sensors can be displayed in this graph for a total of eight possible temperature sensor graphs. A thin blue line separates each set based on the tower or environmental monitor.NOTE: The temperature threshold values are user-defined. You must configure these threshold values on the SNMP/Thresholds page or the Command Line Interface (CLI).Si70050 to 70 °C (F grade)–40 to +85 °C(G grade)

Humidity Status

The Humidity Status graph displays a blinking error whenever humidity exceeds the low or high threshold. The CDU will continue to display this state until the condition changes or the problem has been resolved.For the humidity sensor, the default range of low/high humidity percentage is 0-100% (relative humidity).Up to four sets of dual temperature/humidity sensors can be displayed in this graph for a total of eight possible humidity sensor graphs. A thin blue line separates each set based on the tower or environmental monitor.NOTE: The humidity threshold values are user-defined. You must configure these threshold values on the SNMP/Thresholds page or theCommand Line Interface (CLI).Si700520–80% RH±3.00–100% RH±7.0

The device allows direct connection of various measuring sensors manufacturer Initra.

Sensors are connected to the serial port = P1-P8Communication between the device and the sensor’s RS485. In addition to the communication via these connections are also performed power sensors.All serial connections (P1-P8) are supported by the GPIO input and output.

When each serial port device is configured as a sensor device performs automatic recognition the presence of the sensor and sensor type.The device allows connection of 8 different sensors.




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