Automationdirect.com Productivity 2000 P2-SCM Manual - Page 7
Browse online or download pdf Manual for Control Unit Automationdirect.com Productivity 2000 P2-SCM. Automationdirect.com Productivity 2000 P2-SCM 8 pages. Serial communications
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Diagnostic LEDs
LED
RXD
TXD
RTS
CTS
5V
1 - All RS232 & RS485 LED's reflect the actual electrical level of the signal,
2 - RS232 LED's RXD, TXD, RTS & CTS are turned ON when their voltage on
3 - RS485 LED's RXD & TXD are turned ON when the UART I/O signal is low
4 - 5V LED is ON when 5V power is good, 5V LED is OFF when 5V is shorted
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Port 1
Port 2
X
X
X
X
X
X
X
X
there is no direct firmware control of LED's
the RS232 wire is postive (MARK)
a - This occurs when the UART I/O signal is low (GND)
b - They are turned OFF when the voltage on the RS232 wire is
negative (SPACE)
(GND)
to ground
Port 3
Port 4
X
X
X
X
X
X
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