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Serial/USB
Switch positions 5 to 7 set whether serial or USB is used. If USB is not selected then the chosen switch settings
control the baud rate for the serial interface. Whether the serial interface is RS485 or RS232 is selected by switch
position 8.
5
Baud rate / USB
USB
Off
9600
On
19200
Off
38400
On
57600
Off
115200
On
230400
Off
460800
On
A baud rate of 9600 (and in some cases 19200) is not suitable for 2 way communication
with remote modules as it is too slow and causes timeouts. This baud rate has been included
to enable the base station to be connected to a 9600 baud device to allow low rate Data
Provider packets to be received.
At any rate below 230400 is may be possible to lose packets at high data rates as the serial
connection cannot keep pace with the radio transmissions.
If USB is not selected as the interface (Switch positions 5 to 7) then this switch position selects whether the serial
interface is RS232 or RS485.
8
232/485
RS232
Off
RS485
On
Power
USB base stations will be powered by the USB bus. If RS232 or RS485 are selected then external power will need
to be connected to J4 on the –V and +V pins.
LED Indication
Two LEDS indicate Power/Mode and Activity.
The red LED indicates mode and should flash at a 2Hz rate. If any errors are detected with the radio then the LED
will remain lit.
The green LED flashes once for each packet received or transmitted via radio, USB or serial.
RS232
The RS232 interface uses TX, RX and GND to connect to a PC, PLC etc. and uses standard RS232 voltage levels.
The baud rate can be selected by setting the DIP switches stated above.
The base station will require power cycling to utilise a baud rate change.
Mantracourt Electronics Limited
6
7
Off
Off
Off
Off
On
Off
On
Off
Off
On
Off
On
On
On
On
On
373
T24 Telemetry User Manual
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