Tritech International Ltd
Intelligent Gyro Compass
Prior to installation, a plan should be made of the interface method to be used for the iGC. Pease refer
to
Appendix D
If the operating mode that the iGC is to be used in differs from the mode settings as the unit was
supplied (refer to Appendix A – iGC Supply Specification), the iGC will need to be opened and the
Mode Switch settings adjusted. This is covered in section 7.4.2 below.
If the RS485 or Arcnet telemetry modes are to be used, check that the selector jumpers JP1, JP2 and
JP3 are in their correct positions as the unit was supplied (refer to Appendix A – iGC Supply
Specification). If not, the iGC will need to be opened and the Jumper settings adjusted as described in
section 7.4.2 below. The correct settings are given in the following table:
Table 7.4.1 – Jumper settings
Mode
Jumper JP1
Jumper JP2
Jumper JP3
RS232 only
(don’t care)
(don’t care)
(don’t care)
RS485 (end terminated)
Position 2-3
Position 2-3
IN
RS485 (unterminated)
Position 2-3
Position 2-3
OUT
Arcnet
Position 1-2
Position 1-2
(don’t care)
7.4.2
Adjusting iGC Mode or Jumpers
In order to adjust the Mode switch settings or the RS485 / Arcnet jumper links, the iGC must be
opened. Firstly isolate the iGC supply and disconnect the iGC from its interconnecting cable (if already
connected).
Follow the procedure for iGC Disassembly in section 8.7.1 below. This procedure exposes the internal
iGC components.
Identify the Mode Selector switch (SW1) on the Interface PCB (Item 4 on the G.A.). Refer to the
photograph below, and to the General Assembly drawing in Appendix A.
Issue 2
0707-SOM-00004
Page 19 of 51