Specifications

OPERATIONS
Page 66 MRC-565 Packet Data Radio Operations & Maintenance
Any data logger that MRC supports and has an RS-232 interface may be connected to any one of
the 3 ports on the MRC-565. Normally, the Data or AUX Port is used. You may connect to
either port using a 9-pin “D” type connector:
PIN
FUNCTION
2
TX Data
3
RX Data
5
Ground
Three commands are required to configure the Data Port for proper operation with the particular
data logger being used:
ASSIGN,DTA,OFF [ENTER]
ASSIGN, DTA, 1, type [ENTER]
The first command clears any previous assignments that still may be in effect for the DTA Port.
The second command assigns a specific type of data logger and protocol to the DTA Port. The
specific type of data loggers that MRC supports may be obtained from MRC or your System
Administrator.
The following section explains the interface of Campbell Scientific Data LoggerS to MRC-565.
5.7 CR10X Data Logger
The MRC-565 RF Modem can be used with the Campbell Scientific CR10X data logger to
transmit data from a remote site to a destination in a Meteor Burst (MB) or Line-Of-Sight (LOS)
network. Because of the unique timing of a MB system, the MRC-565 does not provide a real-
time connection between a CR10X and a PC running a data collection program as a pair of
dedicated phone modems would. The connection is a packet store-and-forward type instead.
The design approach used was not to add the MRC-565 to the list of modems supported by the
CR10X, but to add the CR10X to the list of data loggers supported by the MRC-565. Each
CR10X data-array recorded in the final storage is treated as a data logger packet by the MRC-
565. Packets are acquired by the MRC-565 from the CR10X, and delivered through the MB
network to another MRC-565 or master station. The packets are then “printed” on one of the RS-
232 ports at the destination unit in a format that is compatible with all the other supported data
loggers.
In this type of system, the central data system does not “poll” each remote for its data. Instead,
each remote MRC-565 gets the data from the locally attached CR10X using an internal data
acquisition schedule and CR10X driver software module, then routes it to a particular
destination. The MRC-565 driver module uses the CR10X telecommunications commands to
read the data from the final storage. It is then the responsibility of the central data system to store
and process the data as it arrives from each remote site.