COM Express Type 10 PC Connector Carrier Manual
Users Guide
Document: CTIM-00489
Revision: 0.01
Page 19 of 38
Connect Tech Inc. 800-426-8979 | 519-836-1291
Date: 2019-07-04
RS-232/485 Jumper Configuration
Below is a listing of the 3 main configurations of jumper settings for the serial ports on the carrier board.
Positions A & B set the line mode, while positions C – F set BIAS termination for RS-485 signaling.
J1 – RS-232/485 Jumper Block
Position
Jumper Description
A
Serial Mode Bit - M0
B
Serial Mode Bit
– M1
C
Port 0 RS-485 BIAS+
D
Port 0 RS-485 BIAS-
E
Port 1 RS-485 BIAS+
F
Port 1 RS-485 BIAS-
Serial Line Modes
Position A
– M0
Position B
– M1
Port 0 Selected Mode
Port 1 Selected Mode
OFF
OFF
RS-232
RS-232
OFF
ON
RS-422/485
RS-422/485
ON
OFF
RS-232
RS-422/485
ON
ON
Undefined
Undefined
Examples
