SRM-5A CAMPBELL | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 2
Technical content
5] SCIENTIFIC WHEN MEASUREMENTS MATTER SRM- 5A Short Haul Modem Overview The SRM-5A, manufacted by RAD, is an asynchronous modem used for local communication between a datalogger and a computer. Two SRM-5A Short Haul Modems are required: one at the datalogger end and one at Benefits and Features ) Provides the easiest link for communicating with one data logger over longer distances ) Low voltage transmission levels minimize crosstalk between adjacent lines within the same cable. Technical Description Campbell Scientific recommends connecting the SRM-5A to the data logger's CS /0 port via the SC932A interface; a 9- t0-25 pin adapter is required. It may be possible to connect the SRM-5A to the data logger's RS-232 port, but configuration is more complicated; contact Campbell Scientific for more information. Surge protectors on both ends of the transmission line are strongly recommended. the computer end. Each short haul modem transmits over an unconditioned 4-wire telephone line or the CABLE2TP two-twisted pair cable. Data rates up to 9,600 bps are possible. ) Data are transmitted and received at a balanced impedance, providing excellent immunity to circuit noise. ) Transmits up to 6.2 miles using 19 gauge cable at 9600 bps ) Transmits up to 7.6 miles at 1200 bps Approximate Range with Various Data Rates and Wire Gage 19 Gage | 10.0km | 12.2km (09 mm) | (62 miles) | (7.6 miles) 24 Gage | 45km 2.8km (05 mm) | (28 miles) | (3.4 miles) 26 Gage | 33km 4.0km (04 mm) | (20 miles) | (2.5 miles) Power Requirements ) At Computer: uses low power from the EIARS-232-C/CCITT V.24 data and control signals For comprehensive details, visit: www.campbellsci.eu/srm-5a
) At Data logger: combined current drain of the SC932A and RAD modem, which is 2.2 mA quiescent, and 10 to 15 mA active Specifications Data Rates Transmission Mode Transmission Distance or Area Line Interface Transmission Line Transmission Level Terminal Interface SCIENTIFIC Up to 9,600 bps Asynchronous, full duplex, 4- wire operation Upto 12.2km (7.6 mi) depending on data rate and wire gage 5-screw (4-wire and ground) connector block with cable strain relief inside plastic cover CABLE2TP (for short RS-232 or prewired enclosures) or unconditioned, 4-wire telephone line 6dBm EIARS-232-C/CCITT V.24, female integral 25-pin connector ) Protection: ac/dc over voltage connected via isolation transformers rated at 1,500 V RMS Operating Temperature Range Current Drain at 12 Vdc Altitude Humidity Service Requirements Dimensions Weight 0°to 60°C (Manufacturer's temperature specification is listed. Limited tests conducted by Campbell Scientific have shown the SRM-5A to perform at temperatures over -25° to +50°C) 2.2mA (quiescent) 10to 15 mA (active) Up to 3,000 m (10,000 ft) Up to 95% (non-condensing) Dedicated two-twisted pair cable connects one field station with base. 52x52x18cm(2.1x2 in) 38g(1302) 1x.07 For comprehensive details, visit: www.campbellsci.eu/srm-5a CAMPBELL 80 Hathern Road, Shepshed, LE129GX UK | +(0)1509828888 | sale@campbellsci.couk | www.campbellscieu AUSTRALIA | BRAZIL | CANADA | CHINA | COSTA RICA | FRANCE | GERMANY | INDIA | SOUTH AFRICA | SPAIN | THAILAND | UK | USA ©2020 Campbell Scientific, Ltd. | 07/07/2020