4 SERIAL I/O CARDS
3021M100-002
4-3
Cable
The V.24 (EIA-232) Serial I/O Card connects to external devices through a
separately-ordered three-meter (10 ft.) straight through, shielded cable (part no.
CBLA0006-010 with 4-40 screws and no. CBLA0006-110 with M3 screws) with
a male DB-25 connector (ISO 2110) at each end. The V.24 I/O port can drive up to
a maximum of 1880 pF cable capacitance while maintaining compliance with the
applicable regulatory standards. If using cables other than those supplied by
Memotec, ensure that the capacitance does not exceed 1880pF. This can be
calculated from the cable manufacturer’s specifications of capacitance per foot
(pF/Ft), which differs from one cable to the next.
4.1.2 Speeds Supported by the V.24 Serial I/O
The V.24 port can operate without split clocking at the following synchronous
speeds:
• 50 bps - 128 Kbps for external clocking
• 375 bps - 128 Kbps for internal clocking
and at the following asynchronous internal clock speeds:
• 50 bps - 115,200 bps
4.1.3 DTE/DCE Interface Configuration
The V.24 Serial I/O Card’s port can be configured either as a DTE or a DCE
device. The DCE/DTE strapping has been silk-screened on the I/O card to aid in
configuration.
Figure 4-2 V.24 Serial I/O Card, Connector Plat
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