Advantech B+B SmartWorx 485OI9TB Quick Start Manual

7
Time-Out Selection
The RS-485 driver is enabled by the first transmission
of the RS-232 side of the transmit data line (Pin 3). Any
transmission on the TD line keeps the RS-485 driver enabled.
The transmitter is disabled approximately 1ms after the last
transmitted character. This 1ms time out should not have to be
changed for data rates of 9600 baud or higher.
If other time-outs are required, R12 and C7 can be replaced
with component values listed in the table below.
BAUD TIME-OUT R12 (Ohms)
300 33.3 ms 330K
600 16.6 ms 160K
1200 8.33 ms 820K
2400
4.16 ms 430K
4800 2.08 ms 200K
6900 1.04 ms 100K
19.2k 0.520 ms 56K
38.4k 0.260 ms 27K
57.6k 0.176 ms 16K
115.2k 0.0868 ms 8.2K
Document Number: 710-11174-00_485OI9TB_2117qsg
8
Mechanical Diagram
Recommended Accessories
12 VDC Power Supply, 6 W,
Stripped/Tinned, Int'l AC Input,
C7 (mfd)
Int'l AC Blades
0.1
# SMI6-12-V-ST
0.1
0.01
RS-232 Serial Cable,
0.01
6 ft. (1.8 m)
0.01
# 9PAMF6
0.01
0.01
DB9 Male to DB9 Male
Null Modem Adapter
0.01
# MMNM9
0.01
0.01
1-888-948-2248 | Europe: +353 91 792444
707 Dayton Road | PO Box 1040 | Ottawa, IL 61350
Phone: 815-433-5100 | Fax: 815-433-5109
www.advantech-bb.com | E-mail: support@advantech-bb.com
advantech-bb.com

QUICK START

GUIDE
Model 485OI9TB
Optically Isolated RS-232 to
RS-422/485 Converter
Before you begin, be
sure you have the following:
+ 485OI9TB Optically Isolated Converter
+ 12 VDC Power Supply (required, sold separately)
+ RS-232 Serial Cable (optional, sold separately)
+ DB9M-DB9M Null Modem (optional, sold separately)
www.advantech-bb.com
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