ADwin-Gold
USB / ENET, manual version 3.8, October 2005
33
CAN add-on
ADwin
9.1 SSI Decoder
An incremental encoder with SSI interface can be connected to the decoders.
The signals are differential and have RS422/485 levels.
The decoders either read out an individual value (on request) or they conti-
nously provide the current value.
The connections of the 4 decoders are on the connectors CO1...CO4 (15-pin,
DSUB), on the pins 5, 8, 14 and 15 (see fig. 26). If the device is equipped with
the CO1 add-on the remaining pins are reserved for the counter connections.
Fig. 26 – Pin assignment SSI decoder
A voltage input to the connection
CO
Power
in
is supplied at the connectors
CO1...CO4, for example for an external incremental encoder.
Please note: The negative inputs U1
in
(-) are galvanically connected with GND
via a common line, the negative inputs U2
in
(-) have such a connection, too.
Setting the properties
The following properties of the decoders can be set via software:
– Clock rates: With
SSI_SET_CLOCK
clock rates of approx. 40kHz up to
1MHz are possible with a pre-scaler.
– Resolution: Can be set with
SSI_SET_BITS
up to 32 bit.
8
7
6
5
4
3
2
1
15
14
13
12
11
10
9
*SSI, CLK (-)
*SSI, CLK (+)
RESERVED
CLR/LATCH (-)
V2
OUT
(-)
CLR/LATCH (+)
V2
OUT
(+)
*SSI, DATA (-)
B/DIR (-)
B/DIR (+)
*SSI, DATA (+)
A/CLK/PWM (-)
A/CLK/PWM (+)
V1
OUT
(-)
V1
OUT
(+)
CO1, ... , CO4
(male)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
V1
,2
IN
(-)
V1
,2
IN
(-)
V1
,2
IN
(-)
V2
IN
(+
)
V1
IN
(+
)
V1
IN
(+
)
V1
,2
IN
(-)
V1
,2
IN
(-)
V1
,2
IN
(-)
RESERVED
V2
IN
(+
)
V1
IN
(+
)
V1
IN
(+
)
CO POWER IN
(female)
RESERVE
D
