TrailBlazer/SBC
Users Guide
Document: CTIM-00432
Revision: 0.04
Page 21 of 33
Connect Tech Inc. 800-426-8979 | 519-836-1291
Date: 2018-01-05
Serial Configuration
All of the UART Links on the TrailBlazer/SBC are routed into Exar SP335E Transceiver’s. This enables the
various serial outputs (RS-232/RS-485 Half/Full Duplex). To configure the setting, the appropriate
configuration of DIP Switches is required.
RS-232
Switch
Position
Description
1
ON
RS-485/RS-232# Selection
2
XX
Half/Full Duplex
3
XX
Full Duplex TX 120 Ohm Termination
4
ON/OFF
SLEW# Data Rate Limited to 250 kbps
5
XX
Half Duplex Data Enable / Receive Enable#
6
DO NOT USE
System Reserved
RS-485 Full Duplex
Switch
Position
Description
1
OFF
RS-485/RS-232# Selection
2
ON
Half/Full Duplex
3
ON/OFF
Full Duplex TX 120 Ohm Termination
4
ON/OFF
SLEW# Data Rate Limited to 250 kbps
5
OFF
Half Duplex Data Enable / Receive Enable#
6
DO NOT USE
System Reserved
RS-485 Half Duplex
Switch
Position
Description
1
OFF
RS-485/RS-232# Selection
2
OFF
Half/Full Duplex
3
XX
Full Duplex TX 120 Ohm Termination
4
OFF
SLEW# Data Rate Limited to 250 kbps
5
ON
Half Duplex Data Enable / Receive Enable#
6
DO NOT USE
System Reserved
Jumper – UART Control [J3]
Function
Exar XR17V354 Control
Location
J3
Pinout
Position
Description
Top
Exar XR17V354 EEPROM
Bottom
Exar XR17V354 AUTO485 Mode