Interfaces - Mantracourt T24-BSi Technical Manual

Interfaces

RS232
The RS232 interface uses TX, RX and GND to connect to a PC, PLC etc and uses standard RS232 voltage levels.
Handshaking None
Data Size 8 bits
Stop Bits 1 bit
Parity None
The baudrate can be selected by setting the DIP switches stated above. NOTE: the base station will require power
cycling to utilise a baudrate change.
Example connection to a PC 9 way D serial connector.
PC 9 Way D Plug Pin
3 (TX)
2 (RX)
5 (Gnd)
8 (CTS)
RS485
The RS485 interface (This is a 2 wire 485 interface and will not work with 4 wire 485 buses) uses TX, RX and GND
to connect to a PC, PLC etc and uses standard RS485 voltage levels.
Handshaking None
Data Size 8 bits
Stop Bits 1 bit
Parity None
The baudrate can be selected by setting the DIP switches stated above. NOTE: the base station will require power
cycling to utilise a baudrate change.
Example connection
Depending on the RS485 interface or hardware the connections vary and are not standard therefore we can only
show the connections to the base station. You must refer to the user manual regarding your RS485 connection to
ascertain the correct connections.
PC / PLC Connection
Refer to RS485 Device User Manual
Refer to RS485 Device User Manual
Refer to RS485 Device User Manual
NOTE: There are two connectors for RS485, J4 and J5. This is to facilitate easy daisy chaining of devices if
required.
Serial Limitations
When using RS232 or RS485 you should use the fastest baudrate possible. At lower rates data can be lost
•
because it can arrive from the radio faster than the base station can send it serially.
At 9600 baud you will experience communications problems when configuring devices. This baudrate is
•
too slow for anything other than monitoring data provider packets from devices and even then these
should be at a low rate (around 20 per second ). The slow baudrates are provided to get low rate data
into older systems.
RS485 is a bus master system and is not ideally suited to full communications with devices when multiple
•
devices are providing data. This is fine for the normal operation of data acquisition but it is recommended
that only the device to be configured is active during configuration.
17
Mantracourt Electronics Limited T24 Technical Manual
Signal
Direction
-> RX
<- TX
GND
<- CTS
Signal
Direction
A
B
GND
Base Station Connection
J6 Pin 2 or J7 Pin 3
J6 Pin 3 or J7 Pin 2
J6 Pin 4 or J7 Pin 5
J6 Pin 1 or J7 Pin 8
Base Station Connection
J4 Pin 3 or J5 Pin 3
J4 Pin 4 or J5 Pin 4
J4 Pin 5 or J5 Pin 5