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SHM-B ASYNC
end of the loop. Interface is switch-selectable for
DTE/DCE configuration (pins 2 and 3 are reversed)
Connectors — (1) DB25 female, (1) 5-screw terminal
block
Diagnostics — Loopbacks provided by a front-panel
switch: Analog loopback on a 4-wire loop and digital
loopback on equipment interface (EIA-232)
Status Indication — Two bi-color LEDs indicate the
status of the transmitter and receiver. A green light
indicates a “low” logic level (-3 to -25V) on the EIA-232
interface; a red light indicates a “high” logic level (+3 to
+25V).
Operating Temperature — 32 to 112°F (0 to 50°C)
Humidity — 95%maximum, noncondensing
Enclosure — Standalone: High-impact plastic;
Rackmount: Aluminum alloy
Power — Power is supplied by a wall-mounted power
transformer. No more than 16 Vrms is present in unit.