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GUIDE
Document Number: 710-11174-00_485OI9TB_2117qsg
BAUD
TIME-OUT
R12 (Ohms) C7 (mfd)
300
33.3 ms
330K
0.1
600
16.6 ms
160K
0.1
1200
8.33 ms
820K
0.01
2400
4.16 ms
430K
0.01
4800
2.08 ms
200K
0.01
6900
1.04 ms
100K
0.01
19.2k
0.520 ms
56K
0.01
38.4k
0.260 ms
27K
0.01
57.6k
0.176 ms
16K
0.01
115.2k
0.0868 ms
8.2K
0.01
Recommended Accessories
12 VDC Power Supply, 6 W,
Stripped/Tinned, Int’l AC Input,
Int’l AC Blades
# SMI6-12-V-ST
Before you begin, be
sure you have the following:
Model 485OI9TB
Optically Isolated RS-232 to
RS-422/485 Converter
+ 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)
RS-232 Serial Cable,
6 ft. (1.8 m)
# 9PAMF6
DB9 Male to DB9 Male
Null Modem Adapter
# MMNM9
Time-Out Selection
7
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.
Mechanical Diagram
8
