
M3x5/EN M/B
User Manual
Page 30
iSTAT M3x5
8.9.4
Module connections
Terminals Connector
type
BNC for modulated IRIG-B and
Pluggable screw terminals for level-shift IRIG-
B, GPS modem or serial RS232 or RS485
TABLE 8-4: SYNCHRONISATION MODULE CONNECTORS
Connector Position Data
direction
Description
BNC
connector
600 Ohm input impedance: standard Coaxial cable (55 Ohm)
recommended
53
1PPS (GPS) or
IRIG-B (level
shift)
Synchronisation pulse
54 To/From
(A)
RS485
55 To/From
(B)
RS485
56
To
Data reception (Rx)
57 GND
Grounding
58
From
Data transmission (Tx)
Screw
terminal
59 +5V
AUX v5V
(supply for GPS modem)
TABLE 8-5: SYNCHRONISATION MODULE CONNECTIONS
When modulated IRIG-B signal is used it should be connected to the BNC terminal. When
level-shift IRIG-B signal is used it should be connected to 1PPS terminal.
When using a GPS modem the 1PPS signal should be connected to 1PPS terminal and the
serial RS232 signal should be connected to RS232 terminals.
More information regarding the use of the Synchronisation module C can be found in section
10.12.
FIGURE 8-23: SYNCHRONISATION MODULE C LABEL
PLEASE NOTE
The communication port on Module C is primarily dedicated to receive serial coded date and
time telegram from a GPS receiver in order to synchronise the internal real time clock (RTC).
When other methods are used for synchronising the RTC this communication port can be
used as a secondary general purpose communication port.
Please note that either RS232 or RS485 should be used and not both at the same time.
Connector terminals that are not used should remain unconnected otherwise the
communications may not work correctly.
CAUTION
Max consumption of +5V supply terminal is 100mA. When GPS with consumption greater
the 100mA is used it is advisable to use an external power supply.
Summary of Contents for iSTAT M355
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