semaphore TBOX LT2-530 Series, User Manual, Page: 64 / 197

Version : 1.09 64
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
any feature of
TB
OX
LT2
.
8.3.1. Digital Communication Variable
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’.
Example with COM6 – GSM modem
Name
R/W Description
COMx.NoReply
0
Communication: SET by
TB
OX
LT2
in case of error during ModBus “Master”
communication. Possible errors:
-
Timeout.
-
ModBus: Unknown address, wrong quantity, CRC error.
-
TCP/IP: wrong closing of socket.
Must be RESET by the user.
COMx.HookLink *
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
COMx.Call
-
Modem: with GSM acting as “dial-up” modem, reading ‘1’ indicates the modems are
synchronized with
TB
OX
LT2
‘dialing out’
COMx.Answer -
Modem: with GSM acting as “dial-up” modem, reading ‘1’ indicates the modems are
synchronized with
TB
OX
LT2
‘Answering’ incoming call