Advantech BB-485LDRC9 Quick Start Manual

8

Troubleshooting

Timing Issues?
(Usually applies when using RS-485 2-wire)
Model BB-485LDRC9 uses RC time constant. This means that, when
you are setting the DIP switches for the "baud rate", you are setting a
turnaround time, not a "baud rate".
Sometimes, the turnaround time on an RS-485 2-wire device does not
match the turnaround time that is set on the BB-485LDRC9 converter,
even though they are both set for the same baud rate. Refer to the
chart in Step 3 to match the turnaround time of your RS-485 2-wire
device. If you do not know the turnaround time of your device, you can
do the following:
• Keep your device at its current baud rate, but change the
"baud rate" on the BB-485LDRC9. Set it for one or two steps
above or below the baud rate of your device until you get
communication.
• Alternatively, you can use Model BB-485DRCi-PH instead of
the BB-485LDRC9. Model 485DRCi-PH uses bit-wise control
so you do not have to worry about matching the timing of your
device.
Note: Do Not use the shield drain wire as the Signal Ground between
RS-422/485 devices. RS-422/485 systems may communicate
successfully without the Signal Ground when nodes are located
close together and circuit grounds for all nodes are at the same
potential – e.g., a controlled lab environment. However, this practice
is not recommended. If a Signal Ground is not used when nodes
are separated by distance, and there is the possibility of lightning
and/or other electrical noise, the common mode voltage can rise to
levels that could compromise communications, or even damage the
transceivers in the system nodes.
9
UL Installation Information
UL Installation Information
Underwriters Laboratories Conditions of Acceptability
– When installed in the end-use equipment, consideration should be
given to the following:
1. The wiring terminals are suitable for factory wiring only.
2. This device is to be mounted in a suitable enclosure in the end-
product.
3. This device is suitable for operation at a maximum surrounding air
temperature as described in the documentation.
4. These devices are intended for use in a Pollution Degree 2
environment.
• Input Voltage: 10 – 30 VDC
• Input Power: 0.5 Watts
• Wire Range: 12 – 24 AWG
• Tightening Torque: 4 kgf-cm
• Temperature Rating of field installed conductors is 105 °C
minimum, sized for 60 °C ampacity.
• Use copper wire only.
• Maximum surrounding ambient air temperature 80 °C.
Document Number: 20BB710-10764-00_r2_BB-485LDRC9_4619qsg
Recommended Accessories

Serial Cable

Model BB-9PAMF6
Industrial Power Supply
Model BB-MDR-40-24
www.advantech.com
707 Dayton Road | PO Box 1040 | Ottawa, IL 61350 USA
Phone: 1 (815) 433-5100 | Fax: 1 (815) 433-5109
www.advantech.com | E-mail: support@advantech-bb.com

QUICK START

GUIDE
Model BB-485LDRC9
RS-422/485 Converter, Industrial
Before you begin, be sure
you have the following:
+ Model BB-485LDRC9 Serial Converter
+ Required, but not included:
- Power Supply
- RS-232 Cable
- RS-422/485 Cable
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