int_focus_transducer

INT Sony Incremental Focus Encoder

Description

The Sony incremental focus encoder on the INT comprises of:

Sony DG50BP Gauging Probe
Sony LT20-101C Display Unit
RS232 Line Driver
3340 CAMAC RS232 Interface Card
12V PSU

The transducer is a digital incremental encoder with a resolution of 0.5 Micron. The encoder is zeroset from the absolute encoder during the start up of the TCS. The absolute encoder is not used after this. All focus encoding is done from the incremental encoder after start up. If there is a failure of the absolute encoder, then the encoder can be zeroset from the TCS.

Sony LT20-101C Display Unit

The setup menu is entered by pressing and holding <SET> and then, at the same time, pressing and holding <MODE> for two seconds. The menu is scrolled through by pressing <MODE> repeatedly. To change a setting, repeatedly press the up arrow for the options. To program the new setting, press <SET>. The current settings are:

rSLP 0.0005P
rSL 0.0005
E_St St
Forn Norn
bPS 2400
d_LEN 8bit
StoP 1bit
PArY ON
PArY even
rS_IN trG

The RS-232 commands to control the transducer are:

AP=xx.xxxx where xx.xxxx is the initial start value or zeroset value from the TCS (range 0 to 50mm)
R will return the current position in this format A xx.xxxx (If the result is -ve, then a - will be in the space)

Sony Control Box Connections

RS-232
25 Way D-Type Connector	Signal	Sony Mini 8 Pin DIN Connector	Cable Colour
1	Screen	Screen	Screen
2	TXD	4	Yellow
3	RXD	3	Red
4	RTS	6	Blue
5	CTS	5	Violet
7	SG	2	White

RS-422 Line Driver
25 Way D-Type Connector	Signal	Cable Colour
1	Screen	Screen
2	TX-	Red
3	TX+	Blue
4	RX-	Green
5	RX+	Yellow

Sony DG50P Probe
25 Way D-Type Connector	Cable Colour
1	Black
2	Brown
3	Red
4	Orange
5	Yellow
6	Green
7	Blue
8	Violet
9	Grey
10	White
25	Sheild

CAMAC

The RS232 from the Sony LT20-101C control unit is connected to a Kinetic Systems 3340 Communication interface with the following settings:

2400 baud
even parity
One stop bit/character
Normal parity
Branch 4
Crate 3
Slot 21

Zeroset

The Sony LT20-101C will be automatically zeroset from the ASL absolute transducer on starting up the TCS. There will also be a zeroset command that will enable zerosetting from absolute transducer or to a user defined value, should the ASL absolute transducer fail.