Communication Variables; Digital Communication Variable - semaphore TBOX LT2-530 Series User Manual

8.3. Communication Variables

Communication variables are dedicated registers providing different status of the communication.
It is very useful for monitoring and controlling the connection.
Those variables are divided into 2 tabs, Digital Communication Variables (DCV) and Analog Communication
Variable (ACV).
When you need one, double click it from the list and click <OK>! It becomes a Tag and then available in
TB LT2
any feature of
OX

8.3.1. Digital Communication Variable

Name R/W
COMx.NoReply 0
COMx.HookLink *
COMx.Call -
-
COMx.Answer
Version : 1.09
.
Example with COM6 – GSM modem
Description
Communication: SET by
communication. Possible errors:
Timeout.
-
ModBus: Unknown address, wrong quantity, CRC error.
-
TCP/IP: wrong closing of socket.
-
Must be RESET by the user.
Modem:
Reading '1': indicates the modem is on-line
- dial-up modem: connected to another mode
- GPRS/3G: connected to the APN.
Writing '0' : forces a hardware reset of the modem.
Writing '1' : forces the modem to hang up and a GPRS/3G disconnection.
Ethernet:
Reading '1' : indicates the Ethernet is connected to a device (Switch, PC, ...)
Writing '0' or '1': forces a reset of the Ethernet chip. Ethernet communication is not
interrupted.
VPN:
Reading '1' : indicates the VPN is connected
USE A TRIGGER INPUT CONTACT TO ACCESS THE VARIABLE
Modem: with GSM acting as "dial-up" modem, reading '1' indicates the modems are
TB
synchronized with
Modem: with GSM acting as "dial-up" modem, reading '1' indicates the modems are
TB
synchronized with
TB LT2
in case of error during ModBus "Master"
OX
LT2
'dialing out'
OX
LT2
'Answering' incoming call
OX
According to its function a
Communication variable is
Read/Write or Read only.
In the following table, the
column R/W indicates:
- : Read only.
0 : Write '0' only.
1 : Write '1' only.
* : Write '0' or '1'.
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