Using An Ibm At Personal Computer (Rs-232C); Universal Serial Bus Interface; Serial Communication Parameters (Rs-232C) - Lexmark FORMS 249X Technical Reference

Using an IBM AT Personal Computer (RS-232C)

If you are using an IBM AT or compatible computer, use a 9-pin to 25-pin EIA
RS-232C cable.
We recommend one of the following for a 9-pin to 25-pin cable:
• IBM P/N 6450242 (254 mm or 10 in.)
• IBM P/N 6450217 (3 m or 10 ft.)
The following illustration shows the pin assignments for the 9-pin to 25-pin
RS-232C serial cable.
IBM 9-Pin to 25-Pin Adapters
6450242 (254 mm or 10 in.)
6450217 (30.4 m or 10 ft.)
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
9 (F)

Serial Communication Parameters (RS-232C)

The acceptable values for serial communications parameters follow.
Voltage Level Range
The maximum voltage level range for control lines or data lines is from
± 25 positive V dc to ± 25 negative V dc.
Shield
1
2
3
4
5
6
7
8
20
22
25 (M)
Lexmark Null Modem Serial Cable
1038693 (15.24 m or 50 ft.)
Shield
TXD
2
RXD
3
RTS 4
CTS 5
DSR
6
GND
7
DCD
8
DTR
20
25 (F)
Section 6: Using the Printer Interface
F. GND
1
TXD
2
RXD
3
RTS
4
5 CTS
6 DSR
L. GND
7
DTR
20
25 (M)
99