Olson Technology MUSCLE-EM55X - Manual (Page 16)

OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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I/O ports of OTOT-EM55X (optional, XL-versions only)
The OTOT-EM55XL from hardware release 2.0 is optionally equipped with two (2) general purpose I/O and four (4)
input-only binary mode ports. The ports can be configured via the Webserver (HTTP) interface. The schematics of
these ports are given below.
Figure 6 — Schematic for I/O Ports
Figure 7 — Schematic for Input-only Ports
Notes:
• The maximum voltage applied to all ports 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 NEC for 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.