Service manual

Rev. 1.04
- 32 -
EM 220
Mobile Printer Service Manual
3) Serial / USB signal descriptions
Pin No. Signal name Direction Function
1 GND - Ground
2 TXD Output Transmit data
3 RXD Input Receive data
4 nRTS Output
Request to send
Set high when printer is ready to accept a
command or data
5 nCTS Input Clear to send from host
6 GND - Ground
7 GND - Ground
8 D + - Differential data line
9 D - - Differential data line
10 GND - Ground
4) Serial / USB output connector