Epson TM U200D Technical Reference - Page 153
Rev. B, Appendix, TM-U200D/U200PD Technical Manual, This format is used when the UART for RS-232 is connected to the RS-485 driver.
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TM-U200D/U200PD Technical Manual "H" indicates: SD1 < SD2 RD1 < RD2 "L" indicates: SD1 > SD2 RD1 > RD2 The transmission data is H = 1, L = 0 Note: This format is used when the UART for RS-232 is connected to the RS-485 driver. Printer reception data level RD1 RD2 Read data H L Receiving data line is low level L H Receiving data line is high level Printer transmission data level SD1 SD2 H L L H Sending data line is low level Sending data line is high level Send data Rev. B Appendix A-5
Rev. B
Appendix
A-5
TM-U200D/U200PD Technical Manual
"H" indicates:
<Printer transmission data>
SD1 < SD2
<Printer reception data>
RD1 < RD2
"L" indicates:
<Printer transmission data>
SD1 > SD2
<Printer reception data>
RD1 > RD2
The transmission data is H = 1, L = 0
Note
: This format is used when the UART for RS-232 is connected to the RS-485 driver.
Printer reception data level
Printer transmission data level
RD1
RD2
Read data
H
L
Receiving data line is low level
L
H
Receiving data line is high level
SD1
SD2
Send data
H
L
Sending data line is low level
L
H
Sending data line is high level