Olson Technology MUSCLE-EM55X - Manual (Page 18)

OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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I/O port of OTOT-EM55X
The OTOT-EM55X from hardware release 2.0 is equipped with one I/O port. The figure below shows the schematic of
this port.
Figure 10 —
Notes:
• The maximum voltage applied to this port should be not below GND level and should not exceed +5V
DC
.
• The input level for input high should be >3V; the input level for input low has to be < 1V for NEC hardware re-
lease 2.0.
• The input level for input high should be >1.6V; the input level for input low has to be < 0.8V for NEC hardware
release 2.1.
• The input-only port and the open drain output port have a pull-up resistor of about 100kOhms towards 3.3V.
• The active low output resistance to GND of the output port is < 210Ohms.
The OTOT-EM55X uses an 8 pin Mini-DIN connector for external Input/Output handling. The connector is located on
the backside of the device near to the NMS RS485 Master connector.
Figure 11 — Model OTOT-EM55X Rear Panel Connectors