User`s manual

Specifications
27 User’s Manual - DSP19.2 Fast Poll Modem
Mechanical Specifications
Enclosure:
Aluminum with removable front and rear panels
Dimensions:
5.0” wide x 6.5” long x 1.30” high
Weight:
1.0 lbs without AC to DC power converter module
Interface connectors
Leased Line:
5-position screw terminal (includes earth ground)
Data Terminal Equipment:
DB-9 female connector (for RS-232)
RJ-11C module jack (for RS485)
Interface Connector Pin Assignments
Table B-1. Leased Line Terminal Block Pin Assignments
This Pin Number… Corresponds to This Signal…
1 Rx
2 Rx
3 Tx
4 Tx
5 Earth Ground (optional)
NOTE:
When 2-wire half-duplex is used, the TX pair must be used for both transmit
and receive.
Figure 2-9. Back-to-Back Connection to a Second Modem