The transparent channel allows RS232/RS485 devices to communicate with a server by using a tracking device as an intermediary. This connection works both ways:
The RS232/RS485 device can send messages to the server.
The server can also send messages to the RS232/RS485 device.
Device Compatibility
For HCV5-Lite, Pro5-Lite, Pro5, and FM-Pro4 devices, only one port can be used for the transparent channel.
HCV5, LCV5, FM-Tco4 HCV, and FM-Tco4 LCV devices support the use of two ports simultaneously.
Note: This solution is not available on the TrustTrack platform.
Implementation and Configuration
Instructions for client-server implementation can be found in the Ruptela Device Communication Protocol on page 48.
Note: This is not a traditional wiring scheme and may be electrically incorrect, but it is how the solution was designed on Ruptela end.
Important: For the server to send messages to RS232/RS485 devices instantly, a constant link must be enabled.
Transparent Channel Modes
There are two communication flows:
RS232/RS485 device → Ruptela tracker → Server
Server → Ruptela tracker → RS232/RS485 device
Message Sending Behavior
From RS232/RS485 to Server:
If the device receives a message from the RS232/RS485 accessory, it opens the server link immediately and sends the message—no constant link is required. The device stores unsent messages if there is no connectivity or the link is closed.From Server to RS232/RS485:
A constant link is required for immediate delivery.
If a constant link is not possible, server messages will be buffered. The server must wait for the device to initiate a connection or use a trigger to open the link.
Additional:
The server cannot directly initiate a connection to the device—only the device can start the link.
If enabling a constant link is not possible (due to server limitations), the following options are available:
Wait for the device to open the link, and send messages only then.
Trigger the device to connect by sending an SMS command such as connect or econnect.
Switch to a 2nd profile that has a constant link enabled (if a suitable parameter exists).
For two-way communication: a message from the RS232 device may trigger a link, allowing the server to send a response immediately.