B+B SmartWorx 232OTTL User manual

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QUICK START
GUIDE
D oc um en t N um be r: 71 0-1118 3 - 00 _ 2 32 OT TL _ 2117
Before you begin, be
sure you have the following:
Model 232OTTL
Four-Channel Optically Isolated
RS-232 to TTL Converter
+ 232OTTL Isolated RS-232/TTL Converter
+ 12VDC Power Supply (required, sold
separately)
232OTTL Schematic
5
Recommended Accessories
12 VDC Power Supply, 6 W,
Int’l AC Input, 2.5mm Plug
# SMI6-12-V-P230-C1
DB9 Female to DB25 Male
Serial Cable, 6 ft. (1.8 m)
# 232CAM

It is important that only TTL logic (0 to +5V) is used
for the TTL side of the converter.
For assistance with these modications, or to have the
232OTTL modied before shipment, call B+B SmartWorx.
Getting Started
Power
1
3
The 232OTTL is an RS-232 to TTL converter with 1500V
isolation. Channels TD and RTS convert RS-232 to 0-5V
TTL signals and channels RD and CTS convert 0-5V TTL
signals to RS-232. The RS-232 side has a DB25 female
connector pinned out to plug directly into the COM port of
a computer or any other DTE device. The TTL side has a
DB25 male connector.
The RS-232 side of the 232OTTL derives its power from the
outputs of the host RS-232 port. TD, RTS, and DTR lines
may be used to port power the RS-232 side. A minimum
of two of these lines in either high or low states is required
for proper operation. If your port meets the low voltage
requirements of RS-562, you will need to externally power
the RS-232 side of the 232OTTL. An RS-562 port, typically
found on handheld computers, will only produce about
3.7 volts, which is not adequate to power the isolator. To
externally power the RS-232 side, connect the positive lead
of the +12VDC power supply to pin 25 and the GND lead to
pin 12 of the DB25 female connector.
The TTL side of the 232OTTL requires a power supply to
operate. +12VDC may be connected to the power jack on
the side of the unit, or on pins 25 (+12VDC) and 12(GND) of
the DB25 male connector. See the section titled “Options
Requiring Modication” if it is necessary to power the TTL
side from a +5V supply.
Product Overview
TTL
DB25 Male Port
(5V)
RS-232
DB25 Female
1,500 V
Optical Isolation
Signal Lines
2
The 232OTTL supports 4 signal lines and Ground as
shown in Figure 1. Two of these four lines, TD and RTS,
convert RS-232 inputs to TTL outputs. The other two
lines, RD and CTS, convert TTL inputs to RS-232 outputs.
These lines communicate at baud rates up to 38.4 kbps.
Figure 1. Signal Lines Diagram
The maximum sinking current for one TTL output is 8
mA. The maximum source current for one TTL is 0.8 mA.
Signal levels are inverted by the converter in its standard
conguration as shown in Table 1. See “Options Requiring
Modication” section if non-inverted outputs are desired.
TTL INPUT RS-232 OUTPUT
High (>2.0V) -5V maximum, -9V typical
Low (<0.8V) +5V maximum, +9V typical
TTL OUTPUT RS-232 INPUT
High (>2.0V) -5V maximum, -9V typical
Low (<0.8V) +5V maximum, +9V typical
Table 1. Standard Inverted Outputs
Options Requiring Modication
4
The 232OTTL may be modied to non-inverted signals as
shown in Table 2 by placing a jumper wire across JP1:A
labeled “NI”.
TTL INPUT RS-232 OUTPUT
High (>2.0V) +5V maximum, +9V typical
Low (<0.8V) -5V maximum, -9V typical
TTL OUTPUT RS-232 INPUT
High (>2.0V) +5V maximum, +9V typical
Low (<0.8V) -5V maximum, -9V typical
Table 2. Modied to Non-Inverted Outputs
The 232OTTL may also be modied to accept a +5V
supply on the TTL side. Remove the 0 ohm surface mount
resistor labeled R13 and place a jumper wire across JP1:B
labeled +5V. A +4.75 to +5.25V at a maximum of 25mA is
necessary to power the TTL side of the converter when this
modication is made.
232TTL SPECIFICATIONS
Signals
4 channels, TD, RD, RTS, CTS.
RS-232 side pinned out as DCE.
TTL/CMOS compatible voltage levels
(low < 0.8V, high > 2.0V).
Inverted outputs (non-inverted available
with modication).
Baud Rate 38.4 kbps
Power
RS-232 Side
Port-powered by TD, DTR, and RTS
(requires two lines in any state).
OR +12 to 16 VDC at 30 mA maximum
on pins 25 and 12.
Power
TTL Side
+12 to 16 VDC at 25 mA maximum on
power jack OR pins 25 and 12
(+5 VDC available with modication)
Temperature 0 to 70°C