Chapter 2 SPAN Installation
OEM7 SPAN Installation and Operation User Manual v14
52
HG4930 AN01
PwrPak7
Pin
Pin Name
DSUB
HD26
Pin
All I/O
SPAN
Cable
COM2
/IMU DB9
Pin
Pin Name
Description
10
SER_
DATA_
OUT_L
12
8
COM2_
422RX-
Serial Data Low Output (RS-485)
11
NC
–
–
–
Do not connect
12
NC
–
–
–
Do not connect
13
NC
–
–
–
Do not connect
14
NC
–
–
–
Do not connect
For the location of the receiver ground pins and transmit and receive pairs, refer to the
ation and Operation User Manual
or
PwrPak7 Installation and Operation User Manual
.
Enter the following commands on the PwrPak7 to configure the receiver to use the direct connection to the
HG4930 described in the previous table.
1.
CONNECTIMU COM2 HG4930_AN01
2.
SETIMUPORTPROTOCOL RS422
3.
EVENTOUTCONTROL MARK1 ENABLE POSITIVE 100000000 900000000
KVH1750 Baud Rate Conversion
If purchased directly from KVH, the KVH1750 must be configured before it can be used with an OEM7 receiver.
The KVH1750 natively communicates at 921,600 bps, however the maximum baud rate of the COM ports on an
OEM7 receiver is 460,800 bps. Thus, KVH1750 IMUs purchased from KVH must be modified to use 460,800
bps. Also, the MSYNC setting on the KVH1750 must be set to EXT.
Though slower, 460,800 bps is more than adequate to transmit the data at the required 200 Hz
without any impact to performance.
There are two methods to change the KVH1750 IMU baud rate. If an OEM6 receiver is available, a command is
available that will allow the receiver to change the IMU baud rate. If not, a direct RS-422 connection at 921,600
baud is required to change the IMU baud rate.
Connect Directly to the IMU
This method requires a direct connection to the IMU at 921,600 baud over RS-422. Make sure the
RS-422 link used is capable of 921,600 baud as not all serial ports are capable of that rate.
