Vaisala Hydromet Data Collection Platform - Manual (Page 356)

User's Guide ______________________________________________________________________
354 _________________________________________________________________ M210933EN-C
Specifications
PSTN Modem DXM421
Table 79 PSTN Modem Power Input
Property Description/Value
Supply voltage +5 ... +30 VDC
Power consumption 0.8 W, standby 0.45 W
Fuse 0.5A PTC
Transient protection Transil diode
Reverse connect protection Yes
Connector 2 pin screw terminal
Indicator One green LED: Power on
Table 80 PSTN Modem Serial RS-232 Interface
Property Description/Value
Topology RS-232C interface
Serial port speed 300 ... 57600 bps
Connector 6 pin screw terminal
Indicators Three orange LEDs: RI/CD, TxD, and RxD
Table 81 PSTN Interface
Property Description/Value
Modem compatibility ITU V.90, K56flex; ITU-T V.34 enhanced, V.34,
V.32bis, V.32, V.22bis, V.22Bell 212A and
103/113; ITU-T V.29, V.42, V.42bis; ITU-T
V.21 & V.23
Error correction ITU-T V.42 (LAP-M or MNP 3-4)
Data compression ITU-T V.42bis and MNP 5
Transient protection 350 V surge arrestor, PTC-fuses, sidactor
Isolation 1500 V
Connector RJ-11, 2-wire
Table 82 PSTN Modem Mechanical Specifications
Property Description/Value
Housing material EN AW-1050A aluminum, gray anodized
Housing classification IP30 (NEMA 1)
Dimensions w × d × h 25 Ч 80 Ч 76 mm (0.98 Ч 3.15 Ч 2.99 in.)
Weight 94 g (3.3 oz.)