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phone: 360.260.2468
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sales: 800.736.0194
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fax: 360.260.2469
email: sales@usdigital.com
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website: www.usdigital.com
11100 ne 34th circle
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vancouver, washington 98682 USA
AD4-A
Quadrature to RS232 Adapter
US
Digital
C o r p o r a t i o n
TM
Technical Data, Rev. 04.02.03, April 2003
All information subject to change without notice.
Compatible Cables & Connectors:
For more information on Cables & Connectors
please see the Cables & Connectors data sheet.
Ordering Information:
Price:
$125 / 1
$110 / 10
$103 / 50
$ 96 / 100
$ 90 / 500
$ 85 /1K
Cost Modifiers:
Subtract $5 for NP-option (no power supply).
Subtract $5 for NC-option (no cable).
Includes:
PS-9V (power supply).
USD-SW (software).
Cable: 1ft. female DB9 to male D9.
Electrical Characteristics:
Parameter
Min.
Typ.
Max.
Units
Supply Voltage (into AD4-B)
6.0
9.0
16
Volts
Supply Current (without encoders)
-
-
65
mA
RS232 Output High (RXD)
5.0
8.0
-
Volts
RS232 Output Low (RXD)
-
-8.0
-5.0
Volts
RS232 Input High (TXD)
3.5
-
15
Volts
RS232 Input Low (TXD)
-15
-
0.4
Volts
Current to Encoder
-
-
120
mA
Voltage to Encoder
4.9
5.0
5.1
Volts
Quadrature Input Frequency
0
-
1.2
MHz
Non-quadrature Input Frequency
0
-
20
MHz
The above is for over operating temperature range.
Typical values are specified at Vcc=12V and 25C.
The AD4-A adapter provides a simple plug-in method for connect-
ing a single-ended quadrature encoder directly to an RS232 serial
com port. One end of the AD4-A plugs into a standard serial port,
while the other end plugs into a quadrature encoder. A quadra-
ture counter (LS7166) inside the AD4-A keeps track of encoder
position, while a microprocessor provides a serial interface
allowing the user to query the counter for encoder position. A
Windows library is provided to give the user simple access to
AD4-A functions, and a sample program in Visual Basic provides
a template for the user's custom application. The AD4-A is our first
generation quadrature to RS232 adapter and is available for those
customers who have designed it into their products. However, the
AD4-B is recommended for new designs in place of the AD4-A.
The AD4 communicates with a host computer using an eight bit
binary format; binary format, while not readable as ASCII text,
minimizes communication latency and makes data storage com-
pact. The equipment connected to an AD4 must support eight bit
data transfer at a baud rate between 1200 and 115k baud.
US Digital warrants its products against defects in materials and
workmanship for two years. See complete warranty for details.
Note: The encoder interface IC used in this product can be
purchased separately. More detailed information on this IC can be
found on the LS7166 data sheet.
Description:
1 ft. in length
Parameter
Min.
Max.
Units
Storage Temperature
-40
100
C
Operating Temperature
0
70
C
Humidity (non-condensing)
0
95
%
120 VAC Power Supply Input Power
-
6
Watts
Absolute Maximum Ratings:
Mechanical Drawing:
All dimensions in inches.
AD4-A -
NP = No power supply.
NC = No cable.
Pin
Description
1
Index
2
Ground
3
A channel
4
+5VDC power
5
B channel
6
Ground
Pin-out:
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