Scale and motor encoder inputs (15W HDD
socket)
The SPA3-2 can support up to 4-axis scale inputs and 3-axis of motor encoder inputs. Each input supports a RS-422 (TIA/EIA-422) standard
quadrature interface with an edge rate of up to 30 MHz, also supported are discrete and tristate error signals as well as readhead limit
switches.
The scale inputs support absolute readheads using the BiSS protocol as used by Renishaw Resolute™, 18, 26, 32 and 36 bit protocols are
supported.
Pin number
Incremental readhead
Motor encoder
Absolute encoder
1
Not connected
Not connected
Reserved
2
0 V supply
0 V supply
0 V supply
3
- Error
Not connected
Reserved
4
- Reference mark
Not connected
Reserved
5
- B signal
- B signal
MA-
6
- A signal
- A signal
SLO-
7
+ 5.25 V supply
+ 5.25 V supply
+ 5.25 V supply
8
+ 5.25 V supply
+ 5.25 V supply
+ 5.25 V supply
9
0 V supply
0 V supply
0 V supply
10
Limit switch Q
Not connected
Reserved
11
+ Error / limit switch P
Not connected
Reserved
12
+ Reference mark
Not connected
Reserved
13
+ B signal
+ B signal
MA+
14
+ A signal
+ A signal
SLO+
15
Inner screen
Inner screen
Inner screen
Shell
Outer screen
Outer screen
Outer screen
SPA3-2 installation guide
www.renishaw.com
Issued 08 2020
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