beautypg.com

B&B Electronics 232TTL - Datasheet User Manual

Port powered ttl/rs-232 converters

background image

www

.

bb

-

elec

.

com

|

port powered ttL/rS-232 Converters

232TTL, 232OTTL

Models 232TTL and 232OTTL convert RS-232 signals to 0-5 VDC TTL

levels. The 232OTTL provides 1500V optical isolation. Two channels are

used to convert from RS-232 to TTL signals and two channels are used to

convert fomr TTL signals to RS-232.

These converters support 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 232TTL supports baud rates up to 115K baud, the

232OTTL supports up to 38.4K baud.

It is important that only TTL logic (0 to +5V) is used for the TTL side of the

converter. 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 configuration as shown in Table 1.

• Convert 2 channels in each direction from TTL to RS-232
• Baud rates up to 115.2 kbps (38.4 kbps on isolated model)
• Powered from RS-232 data/handshake lines - no power

supply required

• Optically isolated version (Model 232OTTL)

proDuCt FeatureS

aCCeSSorieS

232PS - 12VDC@100mA wall transformer power supply, 2.5mm plug
E1250BL-BB3 - 220-240 VAC to 12 VDC wall power supply, 2.5mm plug

Euro CEE7/7 plug
232CAMS - DB25 male to DB9 female adapter cable, 15.24 cm/6 in
232SGF - 25-pin gender reverser - changes male port to female

orDering inFormation

Model

nuMber

rs-232

ConneCtor

ttl ConneCtor

ttl vdC

isolation

232TTL

DB25 Male

DB25 Female

5V

232OTTL

DB25 Female

DB25 Male

5V

1500V

The 232OTTL has the option for non-inverted outputs. See table 2,

"Operations Requiring Modification" if non-inverted outputs are desired.

Power

The 232TTL requires an external +12VDC power supply connected either

through 2.5mm jack or pins 12(GND) and 25 (+12VDC) on the TTL side.

The 232OTTL requires both Port Power on the RS-232 side, and external

+12VDC power supply connected either through 2.5mm jack or pins

12(GND) and 25 (+12VDC) on the TTL side.

Port power is derived 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. 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.

ttl input

rs-232 output

high (>2.0V)

-5 V maximum, -9V typical

low (<0.8V)

+5 V minimum, +9V typical

ttl output rs-232 input

high (>2.0V)

-5 V maximum, -9V typical

low (<0.8V)

+5 V minimum, +9V typical

table 1: standard inverted outputs

options requiring Modification

The 232OTTL may be modified to non-inverted signals as shown in Table

2 by placing a jumper wire across JP1:A labeled "NI"

The 232OTTL may also be modified to accept a +5V supply on the TTL

side. Remove the 0 ohm surface mount resister 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

modification is made.

ttl input

rs-232 output

high (>2.0V)

-5 V maximum, -9V typical

low (<0.8V)

+5 V minimum, +9V typical

ttl output rs-232 input

high (>2.0V)

-5 V maximum, -9V typical

low (<0.8V)

+5 V minimum, +9V typical

table 2: Modified to non-inverted outputs

232TTL, 232OTTL_3713ds