Specifications

Getting Started About Modems
VisiLogic: Getting Started 35
PLC-side modems
Via modem, a Vision controller can communicate data using:
MODBUS (serial) commands.
VisiLogic's Communication Protocol FB, which enables Vision controllers to
communicate data with most external serial devices, such as bar-code
readers and frequency converters, via their proprietary protocols.
SMS messages. The SMS FB enables text messages, including variable
data, to be sent and received via GSM modems.
e-mail via GPRS (Enhanced Vision only).
GPRS cellular network, to transmit IP packets of data.
Modem Tips
Notes
•
The PC
-
modem cable is not the same type of cable used to
connect between the controller and the modem. Ensure that the
cable used to connect the PC to the modem provides connection
points for all of the modem's pins.
•
If calls are routed via a switchboard, note that the switchboard
settings may interfere with communications. Consult with your
switchboard provider.
•
If, within the modem initialization strings, the parameter S7 is
too short to permit the PLC's modem to answer, an error will
result.
For example, if this parameter is set as S7=30, the PC modem
will wait for 3 seconds to receive an answer from the PLC's
modem. If the PLC modem does not answer before the 3
seconds have elapsed, the S7=30 parameter is exceeded, and
the PC modem returns the No Carrier error.
•
PC/PLC modem communications:
Both
PC and controller must
use the same type of modem: either landline or GSM. Internal
PC modems must be used in conjunction with the driver
provided by the modem's manufacturer.
•
Standard Vision Division
Controllers in this division can only support a single modem.
You can connect a modem to any COM port. However, note
that SB 184 TX Success and SB 185 TX Failed indicate
message transmission status regardless of the actual COM
port connected to the modem.
Enhanced Vision Division
Controllers in this division can support a modem on each
COM port. Each port is linked to a Succeed and Fail SB:
COM1: SB 184 and SB 185, COM2: SB186 and SB 187,
COM3: SB 188 and SB 189.