Using the Topcon GTS-203 EDM and Psion II datalogger
To setup the EDM on a "random" location:
1. Erect tripod and ensure top surface is level. The plumbob may help you judge this.
2. Attach EDM.
3. Level the EDM using the circular spirit level as a guide.
4. When the EDM is approximately level, do the fine-scale levelling using the linear spirit-level. Align the level in turn towards each of the three adjusting knobs, and adjust to horizontal using that knob only.
To setup on a known point, first erect the tripod using the plumbob to centre the head on the marker. Then you need to do the above actions recursively, adjust the position of the instrument by sliding on it on the tripod head (or by moving the whole tripod if it was poorly set up), till the instrument is level and the marker is seen though the vertical eyepiece.
Attach the Psion datalogger (in the R2O case) to the EDM.
Switch on the EDM (green button).
Switch on the Psion (ON button). Press the ON button twice more to load the comms software.
You then need to spin the EDM instrument head in the vertical plane, for it to set its own zero point. Do this either after sighting on the reference point, or spin first then use the "0Set" control (F1) followed by "yes"(F3) when sighting on the reference later.
[To align the EDM head release the horizontal and vertical locks, sight on the target using the sight on top of the head, look through the viewfinder (check the cross wires are in focus - if not focus using the inner ring), focus on the target using the outer ring. When the cross wires in the viewfinder are close to the target, apply the vertical and horizontal locks and use the inner fine controls to align exactly.]
Select DLOG on the Psion and press EXE.
[to select Psion menu options, use the arrow keys to move the cursor, or press the initial letter of the menu item. When correct item is selected, press EXE].
This takes you into the datalogger setup mode.
The SETUP screen has several options:-
SURVEY (undertake a survey)
TRANSFER (not applicable to our setup)
DELETE (delete survey files)
X (exit)
Select SURVEY. You will then be taken through a series of questions to setup your survey station:-
SETUP - give station name [EXE]
RO - give reference orientation name [EXE]
INST HEIGHT - give height (in mm) from ground to -o- symbol on EDM [EXE]
FILE FOR DATA - give filename (save to b:, which is the default).
SIGHT RO - ensure EDM is correctly sighted on reference orientation (this must be a valid sighting or the program will crash out!!!) [EXE]. The datalogger will then instruct the EDM to take a reading.
TGT HEIGHT - give height of target [EXE] (this is used for the subsequent readings)
If this procedure has gone successfully, you will now have logged the reference.
You will now be at the "POINT" screen.
[This screen allows input of point names to initiate reading - this is a good general input screen, but we will use the "CODES" screen instead]
Entering X for the point code takes you to the main Survey Menu:
Point Remark Code
Bs/ro Speed View
Hos Rlevel Os
Inst Setup X
Full explanations of all these commands are given on the next sheet.
For normal use, select
Code.[This assumes that the commonly used codes have already been setup in the file "SYSCODE". This will be the case for our projects. Codes can be setup using the NEW option menu, reached by exiting the CODES screen.]
You will now see two screens full of point code values entered against the letters A-P. The first 8 values are seen first, you can toggle to the second 8 using the up and down arrows. From this point you can log points simply by pressing the appropriate code letter followed by EXE after sighting the EDM. If the code is the same as the last used, just press EXE to take a reading.
Pressing X from this list of codes takes you to the CODES menu:-
CODES - returns you to the code values screen
NEW - edits the code table (don't use this under normal circumstances!)
TGT - changes the target height
MANUAL - allows the use of a code not in the group of 16 in the code table
X - exits and returns to the POINTS screen.
To finish a survey, simply exit from whatever option you are in and go all the way back up to the Psion main menu. Files are stored by default on the RAMPACK (B:), and are quite safe when the machine is switched off (O from the main menu).
1. Ensure the comms link software is on the PC and that the installation directory is included within the path statement on the PC.
2. Remove the Psion II from the R2O case.
3. Remove the RAMPAK from the Psion (to avoid damage from any power surges)
4. Connect the Comms link cable to the Psion and to COM1: on the PC.
5. Type CL to start the comms link server on the PC.
6. Replace the RAMPAK (upper slot).
7. Press ON three times on the Psion, to start the Psion and to load the comms software.
8. Go to COMMS in the main PSION menu
9. Select SETUP from the COMMS menu
10. Use the up and down arrows to move the indicator to each of the following settings, and then use the left/right arrows to adjust the value shown:
Baud -> 9600 default is 1200
Protocol -> PSION default is NONE
11. Press MODE to get to menu options and select EXIT. You will now be back at the COMMS menu
12. Select TRANSMIT [EXE]
13. Select FILE [EXE]
14. Use down arrow to select file to download from B: (if you need to download a file from another drive use MODE to change drive). [EXE]
15. Confirm filename to be used on PC [EXE]
16. Should see file transferred
17. Repeat from 13 with additional files, or use ON to return to higher menus
Appendix 1: SURVEY Menu options
|
POINT |
standard recording mode. Exit by typing X |
|
REMARK |
allows insertion of a remark line into the datafile. Use this option to record key pieces of information not covered by codes, or to record problems. Use also to record the names of, for instance, grid points where the code does not contain more than generic information. |
|
CODE |
recording mode using "hot-keys" to enter point data codes. Codes are stored in the file SYSCODE. Use this option for recording wherever possible. For use see above. |
|
BS/RO |
displays the reference orientation, so you can easily check for accidental rotation of the EDM. |
|
SPEED |
changes speed of instrument. Leave on "rapid". |
|
VIEW |
allows viewing of datafile. Up and down arrows scroll through file. EXE or left/right arrows will exit. |
|
HOS |
horizontal angle of offset. Overwrites last horizontal angle with the one currently displayed on the EDM. Use this to record the centre of trees. (Stand with the staff to side of tree, equidistant from EDM as centre of tree. Record this position, then select Hos, then resight on centre of tree). |
|
RLEVEL |
remote level. For sighting elevated points. Stand with prism directly below point to be surveyed, and use this option. Will then ask to sight on required point and to supply point name. Use for tops of trees, poles, cliffs and details of buildings. |
|
OS |
offset. Allows calculation of position with offset to left, right, towards or away from EDM. Give offset in metres. |
|
INST |
puts instrument in charge. Use REC button on instrument to download data. NOT APPLICABLE TO GTS-203. |
|
SETUP |
allows change to new station within a single file. This appears to switch Psion off. You can then move station, go for lunch, change EDM batteries or whatever. Press ON to reactivate Psion. You will then be asked NEW or EXIT. NEW will take you back to the datalogger setup questions. |
|
X |
exit. |