Sony UP-21MD Service Manual page 76

4-4-6. RS Communication Control
The last output signal is as follows:
Active: 8V
Non-active: -—8 V
The TP position is as follows:
Active: OV
Non-active: +5 V
Signal line name vo Description
DSR Input Operation status (External —> UP)
Data length 8 bits
Stop bit 1 bit
Parity None
Baud rate 1200/2400/4800/9600 bps (Menu switching)
4-4-7. Media Protection such for Software
set the L paper.
UP-21MD V1