User manual

23
2270 Fiber Optic Modem
Chapter 3 - Data Interfaces
3.1 Electrical Data Interfaces
A variety of interfaces are available with the 2270 Modem. Each is designed to conform with
existing standards. Refer to Section 7, Specifications, for applicable configurations, standards
and physical connector types.
PHOTO
Figure 3-1.
2270
Interchangeable
Interfaces
3.2 RS-232C/423 Interface Model -32
This interface is electrically compatible with EIA RS-423A. It will also operate with RS-232C
systems when adhering to the more limiting RS-232C specifications (50-foot distance and
20-kbps data rate). EIA standard RS-423 does not reference physical connector type or pinouts.
This RS-423 interface uses the physical connector type and pinouts specified in RS-232C (refer to
Table 3-A).
The RS-232C/423 interface uses a 25-pin female D-type connector for the physical connection.
NOTE: The control leads support only a local handshake.
3.3 RS-449/422 Interfaces
The RS-449/422 interface is available in several models to suit a wide range of user requirements.
Table 3-B lists the standard models.
This interface is compatible with EIA Standard RS-449. It uses a standard 37-position, female
D-type connector (DC-37). Pin assignments for each of the models are outlined in Table 3-C.
Only a local handshake is supported for the control leads. The maximum data rate specified is
10 Mbps.