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SYSTEM CONFIGURATION
Signal Name
Pin
number
Protective ground
1
Transmitted data
2
Received data
3
Request to send
4
Clear to
5
send
Data set ready
6
Signal ground
7
(common return)
Carrier detect
8
Printer ready
11
Transmit signal
15
element timing
Receive signal
17
element timing
Data Terminal Ready 20
Ring indicator
22
6–16
Table 6–4 lists the serial interface pin assignments.
Table 6–4.
Serial interface pin assignments
Telephone CCITT
AA
101
BA
103
BB
104
CA
105
CB
106
CC
107
AB
102
CF
109
114
115
CD
108
CE
125
The following pins are not used: 9, 10, 12–14, 16, 18–19, 21,
and 23–25.
Source
Description
4235 LPS Data transmitted to host computer system.
Modem
Data received from host computer system.
4235 LPS Asserted to allow the 4235 LPS to send.
Modem
Must be asserted to allow the 4235 LPS to
transmit.
Modem
Must be asserted to allow the 4235 LPS to
receive.
Modem
Must be asserted to allow the 4235 LPS to
receive.
4235 LPS Same as Data Terminal Ready, using TTL
levels.
Modem
The DCE (modem) provides the DTE (4235
LPS) with transmit clocking information.
Modem
The DCE (modem) provides the DTE (4235
LPS) with transmit clocking information.
4235 LPS Asserted by the 4235 LPS when ready to
receive data.
XEROX 4235 LPS INSTALLATION PLANNING GUIDE
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