Brother HL 1240 - B/W Laser Printer Service Manual page 259

RS-100M Interface Connector
Pin Assignment
Pin No.
1
2
3
4
5
6
7
8
8
5
2
Fig. 2-4 Interface Connector
Signal
IBM(RS-232C) Apple(RS-422A)
DTR
DSR
TxD
0V
RxD
2-7
7 6
4 3
1
DTR
DSR
TxD-
0V
RxD-
TxD+
N.C.
RxD+
CHAPTER 2 OPTIONS