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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
via a common line, the negative inputs U2
The following properties of the decoders can be set via software:
– Clock rates: With
SSI_SET_CLOCK
1MHz are possible with a pre-scaler.
– Resolution: Can be set with
ADwin-Gold USB / ENET, manual version 3.8, October 2005
*SSI, DATA (-)
8
*SSI, CLK (-)
15
B/DIR (-)
7
*SSI, CLK (+)
14
B/DIR (+)
6
RESERVED
13
*SSI, DATA (+)
5
CLR/LATCH (-)
12
A/CLK/PWM (-)
4
V2
(-)
11
A/CLK/PWM (+)
OUT
3
CLR/LATCH (+)
10
V1
(-)
2
OUT
V2
(+)
9
V1
(+)
OUT
1
OUT
CO1, ... , CO4
(male)
(-) are galvanically connected with GND
in
(-) have such a connection, too.
in
8
7
6
5
4
3
2
1
15
14
13
12
11
10
9
CO POWER IN
(female)
clock rates of approx. 40kHz up to
up to 32 bit.
SSI_SET_BITS
CAN add-on
Setting the properties
33
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