2020-01
66
WCS* Read Head Position Encoding System
Options and Special Functions
Description of the protocol data
Byte 1
A1, A0 Address bits of the read head. Addresses 0 ... 3, binary coding
OVL 0 The read head is located in the readable area of the code rail
1 The read head is located on WCS3 code rail extender (overlapping
area of the code rail segments)
VAL 0: Position valid
1 Position invalid; code rail area is not unique after the supply voltage
has been connected
DB 0 By default, the diagnostic bit is not set
1 Diagnostic bit, read head dirty
OUT ALL 0 Read head in code rail
1 Read head completely outside of the code rail
OUT 0 Read head in code rail
1 Read head partially outside the code rail. No valid position available
ERR 0 No error
1 Error message (possible errors in XP00 ... XP01 binary coding)
Byte 2 ... 4
XP00 ... XP19 Current position value, binary coding
Byte 5
1
1. For data protocol with velocity output
SP0 ... SP6 Current speed in 0.1 m/s, binary coding
Example:
• 1: Speed = 0.1 m/s
• 37: Speed = 3.7 m/s
• 112: Speed = 11.2 m/s
SST 0 Speed valid
1 Current speed unknown. Last valid speed in SP0 ... SP6 saved
Byte 5/6 Exclusive or link, byte 1 ... Byte 4/5
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