Xerox 4215 MICR MRP Installation Guide
INTERFACE SUPPORT
Serial interface
Serial interface connector
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.
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
Serial interface connector pin assignments
The serial interface signals and functions are listed in table B-3.
Table B-3.
Serial interface connector pin assignments
Pin
Signal name
Function
1
Frame GND
Frame Ground
2
TXD
Transmitted Data
3
RXD
Received Data
4
RTS
Request to Send
5
CTS
Clear to Send
6
DSR
Data Set Ready
7
GND
Signal Ground
8—19
No connection
20
DTR
Data Terminal Ready
21—25
No connection
Null modem
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.
(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.
signals are cross-wired so that the device on each side of the
interface “thinks” that it is receiving signals from a modem.
B-6
XEROX 4219/MRP AND 4215/MRP INSTALLATION PLANNING GUIDE