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INTERFACES
Table 1-6. Asynchronous serial signals and pin assignments
Pin Signal
Telephone Co.
designation
CCITT
designation
1 Protective Ground AA 101
2 Transmitted Data BA 103
3 Received Data BB 104
4 Request to Send CA 105
5 Clear to Send CB 106
6 Data Set Ready CC 107
7 Signal Ground (common
return)
AB 102
8 Carrier Detect CF 109
11 Printer Ready None None
20 Data Terminal Ready CD 108
Null modem
A null modem is a device which eliminates both a modem and a
telephone line. Figure 1-6 illustrates typical null modem wiring.
When the 4213 is used with an asynchronous serial interface
connected to a DTE host (such as a PC-compatible), a modem,
modem eliminator, or a null modem is required. Figure 1-6
shows null modem wiring.
XEROX 4213 LASER PRINTER PROGRAMMER REFERENCE 1-15