SECTION C: CONNECTIONS TO EXTERNAL EQUIPMENT
Page 3
Fig. 3 Connections to Mains and Pulse Inputs
The datalogger should be connected to a spur
fused at no more than 3 A, using suitable cable
rated at 230 V. The unit is designed to be
energized continuously and therefore is not fitted
with a power switch. The gland supplied with the
unit provides strain-relief so long as it is fitted
correctly and sufficiently tightened.
Pulsed input cables should also be fitted using
the supplied gland, which should be sufficiently
tight to provide strain-relief. Twisted-pair
unshielded cabling is recommended. The
Datalogger has wetted inputs that can drive up to
500 m of typical 7/0.2 mm cable.
Fig. 4 Pulse Input Connections to External Devices The datalogger input channels are
wetted with a dc voltage. Polarity
must therefore be observed when
connecting to devices with
solid-state outputs, such as
Sprint, Premier, Encore or Elite
meters.
Each input has a pair of terminals,
labelled ‘H’ and ‘L’. These must
be connected in the manner
shown in Figure 4. 16-channel
dataloggers have two rows of
connnectors; the lower one is for
inputs 9 to 16.
SECTION D: COMMUNICATING WITH DATALOGGERS
PRI dataloggers are fitted with three interfaces for commnunications with external devices.
The PACT port can be used for interrogation by local or remote PCs. A permanent connection can be made as part of a
PACTLAN network, using a PACT Netbox. The PACT port can also be used for connecting a notebook PC using a PACT
lead.
The Modem Input RJ-11 port can be used to connect the datalogger integral modem to a telephone line.
The PACTLAN Output can be used to connect the datalogger to a network of other PRI meters or dataloggers. The
PACTLAN network can only be accessed remotely via the internal modem. It is not possible to access the PACTLAN
network through the PACT port, so it is not possible to use a datalogger as a ‘PACTLAN repeater’.
Each datalogger channel is identified by number based on the hardware serial number which is used by PRI software,
such as EASEii and Principal, when reading out the half-hourly data.
Channel Number Format
8-channel: PD1Ynnnn 16-channel: PD2Ynnnn
Where Y is the channel number, and nnnn is the unique hardware serial number for the datalogger.
For example, a datalogger with serial number PD101234 would have 8 channels addressable by software as PD101234,
PD111234, PD121234, PD131234, PD141234, PD151234, PD161234 and PD171234. 16-channel dataloggers have
channels numbered 0 through F as the fourth character in the address number.
Each channel has an activity LED on the front panel that is illuminated to indicate when a pulse is detected. The LEDs
are labelled A1 to A8 for 8-channel devices, corresponding to inputs 1 to 8 on the input connector. The additional LEDs
on 16-channel units are labelled B1 to B8 for inputs 9 to 16 on the input connector.
The load survey is returned at 1200 bd, time-stamped against GMT, as ‘non-specific pulses’ (BF) data.
