Avtron HS6M Manual de instruções - Página 5

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SSI Protocol "S"

The SSI Protocol "S" provides a clocked set of data bits that

represent the encoder position (in turns and within 1 turn). Each bit

is output by the encoder as the clock input transitions.

Preferred cable: Twisted pair with individual and overall shield

grounded at one end only. 24 AWG, copper conductor, capacitance of

52.5 pF/meter (16 pF/foot) terminated in a 100 Ohm resistive load.

Note that resistive losses in long cables may decrease actual voltage

(+Vs) available at the encoder; larger conductors can be used or the

encoder can be powered locally and signal GND brought through the

cable. Maximum transmission speed is limited by cable length as

shown in the figure below.

10K

1.2K

100

10K

100K

DATA SIGNALING RATE - bit's

Cable Lenght versus data signaling rate

For more details on SSI, consult Wikipedia:

http://en.wikipedia.org/wiki/Synchronous_Serial_Interface

Set Zero

(input, ACTIVE HIGH, Falling Edge, 10K resistance)

To set the encoder count value to zero, raise Set Zero> 10V, < Vs for

more than 1 second. Upon the Set Zero signal returning to logic zero

(falling edge), the encoder count value will be set to zero.

Set Direction

(input, 10K resistance)

For input logic zero or no connection, the encoder will count UP for

CCW rotation as viewed from the rear end of the encoder.

For input logic 1 (>10V, <Vs), the encoder will count DOWN for CCW

rotation as viewed from the rear of the encoder.

10M

HS6M

Analog Protocol "A"

The analog protocol provides a steady-state analog output which

represents the encoder position over a portion of a turn or any

portion of a turn plus a number of turns. The factory default is 0-16

turns = min/max output. This can be modified by using the Set

Lower and Set Upper End Point inputs similar to most electronic

cam-setting systems (described below.)

Preferred cable: Overall shield grounded at one end only. Twisted

pair cable acceptable but not required. Note that resistive losses

in long cables may decrease actual voltage (+Vs) available at the

encoder; larger conductors can be used or the encoder can be

powered locally and signal GND brought through the cable.

0.5-

Output

10V

4.5V

Signal

"3"

"4"

"7"

Code

Min.

Supply

12V

Voltage

Min.

10k

Load

Max.

Any

Load

Settle

Time

Min.

Travel

0.06 turns /22.5 deg.

Turns

Max.

Travel

65536 turns

Turns

Set Lower End Point 1

(input, ACTIVE HIGH, Falling Edge, 10K resistance)

To set the encoder output to the minimum value at the present

position of rotation, raise Set Lower End Point 1> 10V, < Vs for more

than 1 second. Upon the Set Lower End Point 1 signal returning

to logic zero (falling edge), the encoder output will be set to the

minimum output shown in the output table.

Set Upper End Point 2 (input, ACTIVE HIGH, Falling Edge, 10K

resistance)

To set the encoder output to the maximum value at the present

position of rotation, raise Set Upper End Point 2> 10V, < Vs for more

than 1 second. Upon the Set Upper End Point 2 signal returning

to logic zero (falling edge), the encoder output will be set to the

maximum output shown in the output table.

Reset Upper and Lower End Points to Factory Default (16 turn

scaling)

Restore Factory Endpoint Settings (End Point 1, 2)

(input, ACTIVE HIGH, Falling Edge, 10K resistance)

Raise both Set Lower End Point 1 and Set Upper End Point

2> 10V, < Vs for more than 1 second. Upon both signals returning

to logic zero, the encoder output will be reset to the factory default

scaling of maximum output over 16 turns (only applies to the MT

option, and the present position and the encoder will be set to the

mid-point (8 turns) = 1/2 of the maximum output.

0.5-

Units

9.5V

20mA

"8"

"5"

"6"

12V

15V

Vdc

10k

ohms

Any

500

ohms

80mS

Turns/

Deg.

Turns