Technical Reference for ZyXEL omni.net series
D-2
Pin #
Description
ITU-TSS
Signal
Name
EIA
Signal
Name
Signal Description
Signal Direction
DTE - DCE
24
Clock Source:
DTE
113
DA
Transmit Clock Signal
*
25 TI 142
Test
Indicator.
+
Table 82. EIA-232D 25 Pin Serial Port Interface
Async. Hardware Flow Control Cable Connection
Modem
(DCE)
DB25
Signal
to PC (DTE)
DB 9
to DCE (Null)
DB25
To MAC
Mini 8
to NeXT
68,040 Mini 8
2
TXD
3 3 3 3
3
RXD
2 2 5 5
4
RTS
7 5 1 6
5
CTS
8 4 2 8
6
DSR
6 20
7
Ground
5 7 4,8 4
8
CD (DCD)
1 20
2
20
DTR
4 6,8 1
1
22
RI
9
Table 83. Async. Hardware Flow Control Cable Connection
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
