HP PageWriter XL M1705B Service Manual page 213

Table A-7. M-232 Connector JlO
Signal
DCD
nCTS
nDTR
RI
RTS
RXD
TXD
Pin Signal
1 DCD
2 RXD
3 TXD
Definition
Data clear device. RS-232 handshaking signal.
Clear to send. RS-232 signal.
UART
output.
Ring in. RS232 signal.
Ready to send. RS232 signal.
Received data. UART input.
Transmit data. UAR,T output.
Connector Pin Assignments A-7