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© 2009 Active Research Limited
Specifications
The USG-1 ISO-Drive output is a very flexible output that is RS485, RS232, RS422 and NMEA 0183 compatible.
Parameter
Conditions
Min.
Max.
Unit
Supply
Supply voltage
From USB port
4.75
5.25
V
Supply current drawn from USB port
Supply voltage = 5v (no load)
40
46
mA
Supply voltage = 5v (output shorted)
75
80
mA
Opto-isolated Flexible Input
Input voltage b/-
Logical ‘1’
-15.0
0.5
V
Logical ‘0’
4.0
15.0
V
Input current
Maximum is under +35v overload
condition, min @2.0v input level
2.0
9.0
mA
Differential input voltage
Required level for NMEA to be
detected from a connected talker
1.8
2.0
V
Galvanic isolation
Between input & output
2500
V
Overdrive protection
40
V
ISO-Drive Flexible Output
Output voltage b and - (under no
load)
Logical ‘1’
-4.8
-5.2
V
Logical ‘0’
4.8
5.2
V
Output current at max load of 100 ohm
At maximum load, differential drive
voltage reduces to 12.1v
-
21
mA
Output short circuit current (note 1)
Due to short circuit protection
50
55
mA
Galvanic isolation
From Opto-input and (USB) ground
1500
V
Static discharge protection
PC Communication settings
Baud rate
Both input & output Baud rates are set
by the PC software settings
4800
115200
bps
General
Ambient operating temperature
-20
+70
°C
Table 2 – USG-1 specifications
All specifications are taken with reference to an ambient temperature (T
A
) of +2
5
°C.
Note:
1. Short circuit may be applied indefinitely. The ISO-Drive output may be short-circuited directly to a 30 volt battery
supply without damage. A maximum current of 50mA will flow due to “polyfuse” auto-resetting fuse technology
being used in each output.
Summary of Contents for USG-1-B-422
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