This product is no longer available and has been replaced by: COM220. Some accessories, replacement parts, or services may still be available.
COM210A Phone Modem for Australia


To get the same functionality as the COM210A, order the -AU option for the COM220.

The COM210A enabled communications between a computer and a Campbell datalogger via an Australian public switched telephone network. A Hayes-compatible modem was required at the base-station computer while a COM210A was connected to the datalogger at the field site. The COM210A's wide operating temperature range and minimal power requirements made it ideal for use at remote sites.

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Detailed Description

To get the same functionality as the COM210A, order the -AU option for the COM220.


Historically, the 10704 Power Adapter was available for connecting the COM210A to the CR500 with s/n 1764 or lower, and the CR10 with the silver or 8032 black wiring panel. The adapter applied a constant 12 V to the COM210A's serial I/O. This power adapter is no longer available.


Operating Voltage 12 V
Active Current Drain 160 mA
Quiescent Current Drain 120 μA
Baud Rate 1200, 4800, 9600 bps
Operation Full-duplex over standard analog phone lines
Standard Operating Temperature Range -25° to +50°C
Extended Operating Temperature Range -55° to +85°C
Dimensions 16.0 x 4.3 x 9.1 cm (6.3 x 1.7 x 3.6 in.) with mounts
Weight 272 g (10 oz)


Power Considerations

The COM210A consumed 120 microAmps quiescent, 160 mA active (max). The datalogger's power supply was sufficient for most applications.



An SC12 cable was provided for this purpose.

Phone Line-to-COM210A

Typically, a length of phone line was run from the telephone company's junction box to the COM210A's surge protector, and then to the Ground, Tip, and Ring terminals on the COM210A. Alternately, if adequate surge protection was provided by the telephone company and the junction box supports it, a length of telephone wire with RJ11C connectors (#2365) could be run directly from the junction box to the socket on the COM210A.

Surge Protection

If the local telephone company did not provide surge protection, either the 6362 or 4330 surge protector needed to be used. See "Ordering Info" tab for more information.


The COM210A required a desiccated, non-condensing environment; a Campbell Scientific enclosure was recommended. Grommets and screws were provided to attach the COM210A to the backplate of our enclosures.


LoggerNet and PC400 software are compatible with the COM210A. Both of these software packages provide automated error-checking or user-initiated contacts. LoggerNet also supports scheduled contact times. Our software can run unattended allowing the user to take advantage of lower off-hour telephone rates.

Datalogger Considerations

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR5000 CR7X CR9000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000
** *** *

*Although the CR9000X and CR9000 are compatible, the COM210A does not support their fastest communication rates, and is therefore not practical for most of their applications.

**Not compatible with CR500s with s/n 1764 or lower. Originally the 10704 Power Adapter was used to connect the COM210A to these dataloggers. The 10704 adapter is no longer available.

***Not compatible with the CR10's silver or 8032 black wiring panel. Originally the 10704 Power Adapter was used to connect the COM210A to these wiring panels. The 10704 adapter is no longer available.