Guralp Systems CD1.1 - Manual (Page 15)

Operator's Guide
The current scale allows a value between -1.28 and 1.27 to be
represented with 0.01 increments. Note CMG-EAM modules
measure incoming current as positive, and outgoing current as
negative. To convert from the signed byte value x to an analog
value, use:
y=x ×0.01
To convert from the unsigned byte value u to an analog value,
use:
u128: y=u × 0.01
u≥ 128 y =u−256 ×0.01
2.3 The CD1.1 receiver (data-in-cd11)
This module receives CD1.1 frames from external CD1.1
senders (DPs). It is typically used at an array data centre,
where it receives data frames from any CD1.1 senders in the
array; typically each array element or station will have its own
CD1.1 sender.
The receiver is fully standards-compliant, although it has no
support for validating incoming signatures.
The receiver can accept connections and data from multiple,
simultaneous, remote DPs. It correctly identifies and requests
re-transmission of missing data frames by issuing CD1.1
acknack frames.
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