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QUICK START
GUIDE
Do cum ent N umb er: 710 -11170 -0 0_ 422 TT L_ 221 7qs g
Before you begin, be
sure you have the following:
Model 422TTL
Four-channel RS-422/EIA-530
to TTL/5V Converter
+ 422TTL Port-Powered Converter
+ 12 VDC Power Supply (required, sold separately)
Recommended Accessories
12 VDC Power Supply, 6 W,
Int’l AC Input, 2.5mm Plug
# SMI6-12-V-P230-C1
Serial Adapter Cable,
DB9F to DB25M, 6 in. (15 cm)
# 232CAMS
TTL / 5V
DB25 Male Port
Getting Started
1
Model 422TTL converts RS -422 or EIA-530 signals to
5V TTL (“Transistor Transistor Logic”) at data rates up to
115. 2 kbps. Two channels are used to conver t RS- 422 to
TTL. Two channels are used to convert TTL to RS -422.
Product Overview
RS-422 / EI A-530
DB25 Female Port
Pinouts
2
Pin 7 is signal ground for both connectors (see diagram
below).
Open pads are provided for each line. If desired, you can
change the pin connectors for any of the 4 channels.
When converting a second RS-422 channel, use the
corresponding RTS “A” and RTS “B” pins (see diagram below).
422TTL Schematic Diagram
422TTL SPECIFICATIONS
Baud Rate Up to 115.2 kbps
RS-422/
EIA-530
Signals
TDA(-), TDB(+), RDA (-), RDB (+),
RTS A(-), RTS B(+), CTS A(-), CTS B(+)
TTL Signals TD, RD, RTS, CTS
Power Requires 12 VDC external power supply
MTBF 1539882 hours
Model 422TTL inverts the TTL signal. To determine
polarity, refer to the table below .
Model 422TTL - Polarity (Volts)
RS-422 / EIA-530 Output
TTL Input V(A) - V(B)
High Negative
Low Positive
TTL Output V(A) - V(B)
RS-422 / EIA-530 Input
High Negative
Low Positive
Polarity
3
Power
Jack
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