LMI Selcom SLS 5000 - Digital Outputs; Rs232-C; Selcom Serial Synchronous Interface

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Td = delay time, Tc = time constant
Time Error (% of step)
Tc 36 %
2Tc 13 %
3Tc 5 %
4 Tc 2 %
External impedance = 500 ΩTd = 200 µs.
Tc = 80 µs. (at 2 kHz bandwidth)
External impedance = 500 Ω + filter according to appendix C.
Td = 300 µs.
Tc = 100 µs. (at 1.6 kHz bandwidth)
Digital Outputs
RS232-C
No hardware handshaking
Protocol: SLS-ASYNCH-1
Ref: Appendix
Optional
digital:
Selcom serial synchronous interface
The ”Selcom” output is a proprietary synchronous serial output. It uses a clock
and a data signal; with the clock only running while data is being transmitted.
Each data item is 16 bits . The same physical output can also be configured in for
serial as RS422. The Selcom serial is a gated clock /inverted clock and data and
data inverted according to the figure below. MSB is the most significant bit and C
is the “Invalid” bit.
11 10 9 8 7 6 5 4 3 2 1 0 C C C
Data
Data
Clock
Clock
LSB MSB
Figure: Selcom serial synchronous output. Clock rate 16 kHz, gated clock
Logical ”1”: C > 0.6 V + C-inv.
D > 0.6 V + D-inv.
Logical ”0”: C-inv. > 0.6 V + C
D-inv. > 0.6 V + D
Max. Load : (OH = Output High, OL = Output Low)
Voltage: U(OH) > 2.0 V
U(OL) < 0.8 V