0049-1200-XXX RM16M – USER’S GUIDE 12/29/2010
Rev. C
Page 9
of
27
Digital EIA-232 Interface
The 16 EIA-232C or D digital input connectors are labeled and shown in Figure 2-6. For a
description of the active pin connectors, refer to Appendix B.
Figure 2-6.
Table 2-1 shoes the EIA-232 levels from the modem.
NOTE:
Some modems may not use all the functions listed in Tables 2-1 and 2-2.
Table 2-1. Modem EIA Levels
Received data mark:
-5 to -15 V
Received data space:
+5 to +15 V
Control signal OFF level:
-5 to -15 V
Control signal ON level:
+5 to +15 V
Table 2-2 shows the expected levels on all inputs.
Table 2-2. Expected Levels on All Inputs
Mark:
-3 to -25 V
Space:
+3 to +25 V
Controls OFF:
-3 to -25 V
Controls ON:
+3 to +25 V