Specifications

COM1 - RS- 422
* Im por tant Note: All se rial ter mi na tion com po nents are sur face mount 0805 pack ages on the
bot tom side of the board. These should only be in stalled by sur face mount quali fied in di vidu als.
COM2 - RS- 422
Page 2 - 8 OPERATIONS MANUAL EBC-BX 030923
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3 2 1
o o o
1 2 3
o o o
U4 - Not In stalled
U9 - In stalled
U5 - In stalled
1 o o 6
2 o o 7
3 o o 8
4 o o 9
5 o
J15 J17
COM1 DB9
N/C
TX+
TX-
N/C
GND
RX+
RX-
N/C
N/C
RS- 422 NOTE : When used in RS- 422 mode,
the trans mit ter must be en abled by set ting the RTS
bit in the Mo dem Con trol Reg is ter (Bit1).
VCC
RX+
RX-
R112
R114
R116
3 2 1
o o o
1 2 3
o o o
U6 - Not In stalled
U10 - In stalled
U7 - In stalled
1 o o 6
2 o o 7
3 o o 8
4 o o 9
5 o
J16 J18
COM2 DB9
N/C
TX+
TX-
N/C
GND
VCC
R117
R115
R113
RX+
TX-
RS- 422 NOTE: When used in RS- 422 mode,
the trans mit ter must be en abled by set ting the RTS
bit in the Mo dem Con trol Reg is ter (Bit).