Serial Interface - Xerox 4215 Installation Planning Manual

INTERFACE SUPPORT

Serial interface

Serial interface connector
Serial interface connector pin assignments
Null modem
B-6
The serial interface uses a standard female B-type 25-pin
connector as shown in figure B-5. Xerox recommends that you
use the Xerox RS232 25-foot serial cable, part number 9R80254.
Figure B-5. RS232C serial interface connector
The serial interface signals and functions are listed in table B-3.
Table B-3. Serial interface connector pin assignments
Pin Signal name
1 Frame GND
2 TXD
3 RXD
4 RTS
5 CTS
6 DSR
7 GND
8—19 No connection
20 DTR
21—25 No connection
Since both computers and printers are Data Terminal Equipment
(DTE) devices, you need a special cable or adapter called a null
modem to connect them together.
A null modem is a modem eliminator in which all of the control
signals are cross-wired so that the device on each side of the
interface "thinks" that it is receiving signals from a modem.
XEROX 4219/MRP AND 4215/MRP INSTALLATION PLANNING GUIDE
Function
Frame Ground
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Data Terminal Ready