Specifications
30
User’s Manual - SM19202 Fast Poll Modem
Anti-streaming:
27-second timer to prevent transmitter lock-up network
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 modular jack (for RS-485)
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
