SystemBase Eddy-CPU, User Manual

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Eddy-CPU User Guide
21
Configuration Straps and Jumper Settings
Designation Setting Feature
1-2
Eddy-S1/TTL input voltage is set to 3.3V
Eddy-S1/TTL can take in either 3.3V or 5V. Be sure to check the input
voltage label sticker on the board and set the jumper accordingly.
(Eddy-CPU input voltage is set to 3.3v regardless of J1 settings.)
Power select
Jumper(J1)
3-4 Eddy-S1/TTL input voltage is set to 5V
1 INF1
2 INF0
Serial Interface Configuration INF[1:0] = ‘00’ , RS232
INF[1:0] = ‘01’ , RS422
INF[1:0] = ‘10’ , RS485
Serial Interface Configuration applies only to Eddy-S1/TTL products.
Default setting(OFF) is configured to Eddy-CPU DK.
3 TTL/CPU
Determines output power of serial port.
When testing Eddy-CPU DK , turn the switch OFF.
When testing Eddy-S1/TTL , turn the switch ON.
4 NC No Connection
5 422_TR
Termination Resistor can be installed when configuring RS422 mode.
If operating under RS422 mode, 485_TR must be switched to “OFF”.
422_TR may be switched to “ON” depending on the existence of
termination resistors.
Switch
Part
(SW1)
6 485_TR
Termination Resistor can be installed when configuring RS85_mode.
If operating under RS485 mode, 422_TR must be switched to “OFF”.
485_TR may be switched to “ON” depending on the existence of
termination resistors.
[ Eddy-CPU Configuration(RS232 Only) ]
[ Eddy-S1/TTL Configuration ]