Instruction manual

Appendix A-10 Rev. A
"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