Rabbit EM1500, Product Manual, Page: 34 / 120

30
www.rabbit.com
EM1500 Specifics
4.3.5 9-Pin Connector
The 9-pin connector has various I/O connections plus relay contacts. In0-2 are TTL level inputs which
may be jumpered for all pull-up or all pull-down. Factory default is pull-up. Pull-down requires moving
the zero ohm resistor on JP1. Out0 and Out1 are open collector outputs with diode clamps to ground and
the input supply, capable of sinking up to 750 mA with voltage up to input voltage ± 0.5 V.
Figure 4.7 9-Pin Connector
4.3.6 10-Pin Connector
The 10-pin connector is shown in Figure 4.5 .
If SER3 is not configured in software to be a 9-wire port, 4 of the pins on the 10-pin connector (PF0-3)
become available for general purpose I/O; PF4 is always available. PF0-4 may be configured as inputs or
outputs at TTL levels. PF0-4 have 470 ohm series resistor protection , which allows them to tolerate
RS232-level signals. However, the loading of the RS232 input signal may be too high for some equipment.
Internally, the connection is terminated by diode clamps to GND and Vcc (3.3 V).
Relay common
Relay N.C. (Normally Closed)
Relay N.O. (Normally Open)
Out0
Out1
In2
In1
In0
1
9
GND