AHRS400 Series User’s Manual
Doc# 7430-0004-01 Rev. A
Page 7
The serial interface connection is standard RS-232. On a standard DB-25
COM port connector, make the connections per Table 2.
Table 2. DB-25 COM Port Connections
COM Port Connector
DMU Connector
Pin #
Signal
Pin #
Signal
2
TxD
2
RxD
3
RxD
1
TxD
7
GND*
4
GND*
*Note: Pin 4 on the DMU is data ground as well as power ground.
On a standard DB-9 COM port connector, make the connections per Table
3.
Table 3. DB-9 COM Port Connections
COM Port Connector
DMU Connector
Pin #
Signal
Pin #
Signal
2
RxD
1
TxD
3
TxD
2
RxD
5
GND*
4
GND*
*Note: Pin 4 on the DMU is data ground as well as power ground.
Power is applied to the DMU on pins 3 and 4. Pin 4 is ground; Pin 3 should
have 9-30 VDC unregulated at 275 mA. If you are using the cable supplied
with the DMU, the power supply wires are broken out of the cable at the
DB-9 connector. The red wire is connected to VCC; the black wire is
connected to the power supply ground. DO NOT REVERSE THE POWER
LEADS.
The analog outputs are unconnected in the cable Crossbow supplies. The
analog outputs are fully buffered and conditioned and can be connected
directly into an A/D. The analog outputs require a data acquisition device
with an input impedance of 10k
Ω
or greater for DAC outputs and relatively
higher input impedance for raw analog outputs.
3.3
Interface
The serial interface is standard RS-232, 38400 baud, 8 data bits, 1 start bit,
1 stop bit, no parity, and no flow control.
Crossbow will supply DMU communication software examples written in
LabView. Source code for the AHRS serial interface can be obtained via
SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:[email protected]
SUNSTAR自动化 http://www.sensor-ic.com/ TEL: 0755-83376489 FAX:0755-83376182 E-MAIL:[email protected]
