HG4930 Installation and Interface Manual
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aerospace.honeywell.com/HG4930
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Table 1. Connector Pin Description
Electrical Interface
The pin assignments of the external system connector are shown below.
Logic 0 corresponds
to the CMOS “low” logic state. Logic 1 corresponds to the CMOS “high” logic state.
PIN #
SIGNAL NAME
INPUT/OUTPUT & SIGNAL TYPE
SIGNAL FUNCTION
1
DGND
Ground
Digital Power and Signal Return
2
+5VDC
Input
+ 5 VDC Power – See Table 2
3
No Connect
4
No Connect
5
No Connect
6
RESET
Input
CMOS Compatible Logic
Logic 1 applied for 7 milli-seconds will stop all
processing. Upon logic 0, the IMU will restart as if
power had been removed. No connection is required
(active pull down to logic 0).
7
No Connect
8
No Connect
9
SER_DATA_OUT_H
Output RS-422
Asynchronous High
10
SER_DATA_OUT_L
Output RS-422
Asynchronous Low
11
DATA_SYNC_OUT_H
Output RS-422
Data Sync High
12
DATA_SYNC_OUT_L
Output RS-422
Data Sync Low
13
No Connect
14
No Connect
Table 2. Input Power Specifications
VOLTAGE
(VDC)
TOLERANCE
MAX RIPPLE
(MV P-P)
MAX RUN CURRENT
(AMP)
MAX CURRENT
(MA)
+5
±5%
50
1.0
700
The 5V power application to the IMU must monotonically increase from 1 to 5 volts for proper IMU
start-up. The maximum current shown in Table 2 does not include in-rush current.
Figure 1 provides representative voltage and current plots at hot and cold for a ~ 2ms start time.
Worse case steady state current shown is ~500 mA (cold) and peak current shown is ~800 mA.
Unit typically draws < 400 mA in normal operation.
Figure 1. Typical Cold (Left Figure) and Hot Voltage/In-Rush Plots
