Product Overview
Campbell Scientific COM200 Dial-Up Modem for CR10X, CR510 and CR23X Field Stations
Condition
Used, in great cosmetic condition with very little signs of use. We do not have the setup to fully test these units, so they are sold untested. The photographs show the two units in stock: black anodized brushed aluminum housings, crisp white legend printing, and clean orange TIP / RING / GND terminal blocks. The top label reads COM200 MODEM with Campbell Scientific Inc., Logan UT., FCC Registration No. B9QUSA-31402-MM-T, Ringer Equivalence 0.5A, Required Connector USOC RJ11C, and MADE IN USA. Serial stickers read SN: 1955 and SN: 3634, and an Industry Canada label reading 802 8134 A sits on the connector end of each unit. Light handling scuffs show on the anodized sides, the RJ11 contacts and the 9-pin CS I/O pins are bright and undamaged, and the mounting flanges with their keyhole slots are straight. In the photos, one unit carries an extra green two-position pluggable connector beside its RJ11 jack and the other does not, and one unit has a small sealed bag of hardware taped to its side. No photo shows both extras on the same unit or ties either one to a serial number.
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Product Overview
The COM200 is Campbell Scientific's field telephone modem for remote data transfer, built in Logan, Utah and marked MADE IN USA on the top label. It hangs off the datalogger's 9-pin CS I/O port, draws its 12 VDC from the logger, and answers or dials over an ordinary voice-grade line so an unattended station can send its data without anyone driving out to it. Supported loggers include the CR510, CR10(X), 21X(L), CR7, CR23X, and CR5000. The line side is an RJ11C jack, with an orange three-position screw terminal block on the top face legended TIP, RING, and GND for hardwired connections. The whole thing lives in a rugged extruded aluminum case with screwed-on end panels, open connector cutouts, and keyhole mounting flanges at each end, sized for the inside of a field enclosure rather than a desk.
Key Features
- Model: COM200 telephone modem, Campbell Scientific Inc., Logan UT.
- Compatible loggers: CR510, CR10(X), 21X(L), CR7, CR23X, CR5000
- Baud rates: 300, 1200, 4800, 9600 bps
- Command set: Hayes-compatible AT commands
- Error correction: V.42 LAPM and MNP2-4 supported
- Dialing modes: pulse and tone
- Low-power standby: under 120 microamps when idle
- Active current: about 140 mA during communication
- Power supply: 12 VDC from the datalogger
- Data connector: 9-pin CS I/O port (male D-sub, gold pins visible in the photos)
- Phone line connector: RJ11C jack, plus an orange TIP / RING / GND screw terminal block
- Label markings: FCC Registration No. B9QUSA-31402-MM-T, Ringer Equivalence 0.5A, Part 15 Class A, Industry Canada 802 8134 A
- Housing: rugged metal case with keyhole mounting flanges, built for field operation
- Operating temp: -25 C to +50 C standard, -55 C to +80 C optional extended range
- Size: 13.2 x 4.3 x 9.1 cm
- Weight: 0.27 kg
Applications
- Hydrologist keeping a CR10X stream-gauge station reporting over the copper pair it has always used
- University lab technician bringing a 21X or CR23X weather station back to life for teaching and archived data pulls
- Water utility maintaining an unattended pump-house logger in a canyon where cellular coverage is unreliable
- Agricultural research site adding a second dial-up path as backup to a newer telemetry link
Frequently Asked Questions
Which Campbell Scientific dataloggers will this work with?
The COM200 is listed for the CR510, CR10(X), 21X(L), CR7, CR23X, and CR5000. It connects through the 9-pin CS I/O port and takes its 12 VDC power from the logger, so there is no separate supply to find. If your logger is not on that list, check the COM200 manual for your model before ordering.
Has this modem been tested?
No. We do not have a Campbell Scientific logger and a dial-up line set up on the bench, so it is sold untested. What we can tell you is what the photos show: clean connectors, undamaged pins, intact labels, and only light handling marks on the case. Operation is not confirmed - verify against the Campbell Scientific COM200 manual before you commit it to an unattended station.
What is included?
The Campbell Scientific COM200 modem only. No cables, phone cord, power leads, or software. Among the two photographed units, one has an extra green two-position connector fitted next to the RJ11 jack and one has a small sealed bag of hardware taped to its side, and the photos do not show whether that is the same unit; either way, we are not promising those extras as part of the sale. If you want a specific serial number or the extras confirmed before you order, message us and we will look at the actual piece on the shelf.
How does the phone line connect - jack or terminals?
Both are on the unit. There is an RJ11C jack on the connector end for a standard phone cord, and an orange three-position screw terminal block on the top face legended TIP, RING, and GND for a hardwired line coming into a field enclosure. The label lists Ringer Equivalence 0.5A and pulse or tone dialing.
Why buy one or two COM200 units here instead of a bulk lot elsewhere?
Because almost nobody needs ten field modems. If you need one spare for a single station, or two to cover a primary and a backup, that is exactly what you can buy here rather than bidding on a pallet of surplus telemetry gear. Shipping is $8 flat rate and free over $28, and orders go out the same or next business day from Idaho.
Before cellular telemetry, a copper pair and a patient little modem were how a remote weather station phoned home. If you are keeping a Campbell Scientific logger on the line, this Logan-built box still knows the number.
