Installation manual

Connecting peripheral equipment
91
851-164510 / Rev.E
8.3 Course gyro connection
Overview
The SP90 sonar can read the course information from an
RS-232 serial line. In case where only a 3-phase synchro or
stepper signal is available, an optional Gyro Interface Unit must
be used for converting these signals to RS-232 serial line
format.
Gyro with RS-232 serial line output
The course data on the RS-232 serial line must be on a standard
NMEA 0183 telegram format. The telegram can contain both
the speed and the course data.
For connection to the course gyro, refer to the applicable gyro
documentation.
Gyro with 3-phase synchro or stepper output
If only a 3-phase synchro or stepper signal is available, an
optional gyro interface unit must be used to convert these
signals to RS-232 serial line format. An LR40 Digital Gyro
Repeater may be used for interfacing the following signals:
• 3-phase synchro signal, 20-115V L-L, 50/60/400 Hz, gear
ratio 1:360 or 1:180
• 3-phase stepper signal, 20-115V L-L, gear ratio 1:360 or
1:180
The LR40 Digital Gyro Repeater can be delivered from Simrad
on part number 298-078535. For connections to the LR40
Digital Gyro Repeater, refer to the LR40 Instruction Manual.
References
→ Telegram format description, page 170
→ Gyro Interface Unit; page 7
→ Serial line interface, cable drawing, page 191