8
ATIM_ACW-D_UG_EN_V1.5
b.
Connecting the modem
Terminal blocks:
Antenna (SMA):
Before powering the product, a 50
Ω
/ 868MHz antenna must be connected, either directly
to the SMA connector or via a 50
Ω
cable in case of antenna offset.
Power supply (bottom terminal block):
The ACW-RS module must be powered with a DC power supply between 10V and 30V that
can supply a minimum current of 100mA.
RS232/RS485 (top terminal block):
The maximum cable length will depend on the type of serial link and the baud rate used. A maximum length
of 1 meter is suitable for all use cases.
For an RS232 connection it will also be necessary to switch the slide switch to the lower position (USB side).
For an RS485 connection, you have the option to activate the 120
Ω
termination resistor:
•
up (SMA side): resistor activated
•
down (USB side): resistor deactivated
The USB connector is used to configure the ACW via a PC and a USB cable. See the 'Modem Configuration'
section for more details.
➔
The configuration must be done with the device powered by 10 / 30Vdc
c.
LEDs meaning
When the power is turned on or after removing the USB cable, the red LED (bottom LED) stays on for 3
seconds, indicating the start cycle. Then, the green LED (top LED) illuminates for a moment indicating a good
start of the ACW.
Name
Description
In / Out
GND
Earth/Ground (Gnd)
In (power supply)
10/30V
Power supply between 10V and 30V
Earth
NC
Not connected
/
Tx/BZ
RS232 Tx
Output
RS485 BZ
Bidirectional/differential
Rx/AY
RS232 Rx
Input
RS485 AYm
Bidirectional/differential
NC
Not connected
/
