© 2004 by B&B Electronics. All rights reserved.
232TTL-0812- 1/2
B&B ELECTRONICS
Model 232TTL
0B
Four-Channel RS-232 to TTL Converter
Description
The 232TTL converts RS-232 to TTL levels. Two channels are used to convert from RS-232 to 0 to +5 VDC TTL
signals and two channels are used to convert from 0 to +5 VDC TTL signals to RS-232. This converter supports RD,
TD, RTS, and CTS. The DB25P male connector (DCE) is for the RS-232 side. The DB25S female connector is for the
TTL side. The pins used are:
DB25P Male
RS-232
Pin
U
U
DB25S Female
TTL
Function
U
U
U
Pin
2
3
4
5
(input) .................................TD .............................. 9 (output)
(output) .............................. RD............................. 14
(input)
(input) ............................... RTS............................ 16 (output)
(output) ............................. CTS............................ 23
(input)
Pin 7 is signal ground for both connectors. The unit can work at baud rates up to 115K baud. On the RS-232 side, pins
8 (DCD), 20 (DTR), and 6 (DSR) are connected to open pads, if you would rather use these instead of the given RS-
232 lines. Another feature is that the TTL and RS-232 pins can be changed by connecting wires from the pins you want
to pads that have been provided. The unit needs a +12VDC power supply (100 mA approx.). A power supply is
available from B&B Electronics.
It is important that TTL logic, and only TTL logic (0 to +5 VDC) is used for the TTL side of the converter. The maximum
sinking current for one TTL output is 3.2 mA. The maximum source current for one TTL is 1 mA. Signal levels are
inverted by the converter. Please refer to table below.
Polarity
TTL Input
low
high
DECLARATION OF CONFORMITY
RS-232 Output
positive
negative
Units
volts
volts
Manufacturer’s Name:
Manufacturer’s Address:
TTL Output
RS-232 Input
positive
negative
Units
volts
volts
PRODUCT INFORMATION
low
high
Model Numbers:
Description:
Type:
Application of Council Directive:
Standards:
B&B Electronics Manufacturing Company
P.O. Box 1040
707 Dayton Road
Ottawa, IL 61350 USA
232TTL
Four Channel RS-232 to TTL Converter
Light industrial equipment
89/336/EEC
EN 55022
EN 61000-6-1
EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11)
Robert M. Paratore, Director of Engineering
www.bb-elec.com
orders@bb-elec.com support@bb-elec.com
International Office:
707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104
European Office:
Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445
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