Two SRM-5A RAD Short Haul Modems support local communications between Campbell Scientific dataloggers and a computer with an RS-232 serial port. These asynchronous modems use a 4-wire unconditioned telephone line or the CABLE4CBL-L cable for transmission; data rates up to 9,600 bps are possible. Their low voltage transmission levels minimize crosstalk between adjacent lines within the same cable. Data are transmitted and received at a balanced impedance, providing excellent immunity to circuit noise.
LoggerNet Datalogger Support Software, installed on an IBM-PC® or compatible computer, provides software support for data retrieval, datalogger program upload/download, and remote monitoring.

Features

Provides the easiest link for communicating with one datalogger over longer distances
Requires a short haul modem at both PC and datalogger
Uses two twisted-pair cable for a direct connection
Transmits up to 6.2 miles using 19 gauge cable at 9600 bps
Transmits up to 7.6 miles at 1200 bps

Specifications

Data Rates: up to 9,600 bps
Transmission Mode: Asynchronous, full duplex, 4-wire operation
Transmission Range:up to 7.6 miles (12.2 km); see Table 1 in product brochure
Line Interface: 5-screw (4-wire and ground) connector block with cable strain relief inside plastic cover
Transmission Line: CABLE4CBL (for short RS-232 or prewired enclosures) or unconditioned, 4-wire telephone line
Transmission Level: 6 dBm
Terminal Interface: EIA RS-232-C/CCITT V.24,
female integral 25-pin connector
Altitude: up to 10,000 ft (3000 m)
Power Requirements
At Computer: uses low power from the EIA RS-232-C/CCITT V.24 data and control signals
At Datalogger: combined current drain of the SC932A and RAD modem, which is 2.2 mA quiescent, and 10 to 15 mA active
Protection: ac/dc over voltage connected via isolation transformers rated at 1,500 V RMS

Producing Area:USA