Sierra Wireless AirLink RV50 Series User Manual page 498

ALEOS 4.9.0 Software Configuration User Guide for AirLink RV50 Series
Rev 1 Dec. 17
Figure F-3: ACEmanager: Status > Serial
When you poll the AirLink gateway/connected device:
• If the Serial bytes sent counter increases, the IP packets have reached the
AirLink gateway from the mobile network, the AirLink gateway has removed
the header and sent the packet contents out its serial port to the connected
device.
• If the Serial bytes sent counter does not increase, either:
· The IP packet has not made it across the mobile network to the AirLink
gateway.
· The destination port for the TCP/IP or UDP/IP connection does not match
the configured Device Port on the ACEmanager Serial tab.
3. Once you have confirmed that the Serial bytes sent counter is increasing,
check the Serial bytes received counter (also on the Status > Serial screen).
· If the Serial bytes received counter is increasing, the connected device is
responding to the poll request and sending its response back to the AirLink
gateway across the serial connection.
· If the Serial bytes received counter is not increasing, the connected device
is not responding to the poll request. Ensure that the serial cable is fully
seated and properly connected to the AirLink gateway and the host. Check
that you have the correct type of serial cable connecting the AirLink
gateway to the connected device. The AirLink gateway is a DCE device. If
the connected device is also a DCE device, use a null modem serial cable.
If the connected device is a DTE device, use a straight through serial cable.
4. If you have confirmed that both the Serial bytes sent and Serial bytes
received counters are increasing when you send a poll to the connected
device, but you are still not receiving the response back on your original
sending application, the most common reason is that the incoming packets
from the AirLink gateway to your application are being blocked by a firewall on
your network. The firewall may be blocking all traffic except packets destined
for particular ports or arriving from particular ports.
Check with your firewall administrator. Ask the administrator to monitor the
firewall when you poll the AirLink/connected device to see if any return pack-
ets from the AirLink gateway hit the firewall.
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