B&B Electronics VFG3000 - Manual - Manual (Page 377)

T ROUBLESHOOTING S ERIAL C OMMUNICATION
R EVISION 1 P AGE 361
S
ERIAL
C
OMMUNICATION
This section is used to troubleshoot the communication between two devices linked via serial
ports, i.e. RS232 or RS485.
TIP: For communication troubleshooting, it is strongly advised to create a new Fieldbus
Gateway Manager database including only one data tag mapped to a known register in
the target device.
P ROBLEM P OSSIBLE C AUSES P OSSIBLE S OLUTIONS
Values show “----
” Port settings do not match. Check that the port settings of the
Fieldbus Gateway Manager device
match the target device (i.e. Baud,
Parity, etc.).
Incorrect target device address. Check that the target device address
in Fieldbus Gateway Manager (in
communications on the PLC
symbol) matches the target device
address setup.
Incorrect cable Check the cable part number or
cabling to match your protocol.
Incorrect communication port Check if the cable is connected to
the right communication port.
If the above is correct, check that the
protocol settings are on the right
communication port in Fieldbus
Gateway Manager.
Communication port connector
pins bent inward. Although unlikely, check the
communication port connector pins
on the B&B Electronics device in
case some are bent inward resulting
in a bad contact with the cable.
Incorrect tag mapping Check that the tag is mapped to an
existing register in the target device.
Values blink
between the data
and “----” Incorrect tag mapping on one
of the tags on the display. Delete tags one after another and
download in-between. When the
values on the screen stop blinking,
the last deleted tag was mapped
incorrectly or accessed an unknown
register in the target device.
Communications times-out. Increase the Slave Response or
Device Timeout on the
communication port or target device
in Fieldbus Gateway Manager.