APPENDIX B OEM729 Technical Specifications
OEM7 Installation and Operation User Manual v4
162
Pin
Signal
Name
Signal
Type
Signal
Direction
V
IL
Max
(V)
V
IH
Min
(V)
V
OL
Max
(V)
V
OH
Min
(V)
Drive
(mA)
Description
18
COM1_
RX/
COM1_
RXD+
COM1_
RX:
RS-
232
Input
0.7
2.1
-
-
-
This pin is internally
multiplexed. COM1_RX
is the default.
COM1_RX: COM1
Receive Data input
(±25V tolerant).
C: This is
one half of the COM1
RS-422 receive
differential pair (2V
differential typical).
COM1_
RXD+:
RS-
422
Input
-
-
-
-
-
19
COM3_
TX/USER0
3.3V
CMOS
COM3_TX:
Ouput
-
-
0.4
2.9
4
This pin is internally
multiplexed. COM3_TX
is the default.
COM3_TX: COM3
Transmit Data output.
USER0: User GPIO.
Internal 10 kΩ
pulldown.
USER0:
Input
0.7
2.1
-
-
-
20
COM1_
TX/
COM1_
TXD+
COM1_
TX:
RS-
232
Output
-
-
-
-
-
This pin is internally
multiplexed. COM1_TX
is the default.
COM1_TX: COM1
Transmit Data output.
(±25V tolerant)
For SPAN applications,
this pin can be
configured to output a
timing signal
periodically (generally
1PPS).
C: This is
one half of the COM1
RS-422 transmit
differential pair (2V
differential typical)
COM1_
TXD+:
RS-
422
Output
-
-
-
-
-