Alstom iSTAT M355, Manual, Page: 63 / 154

User Manual M3x5/EN M/B
iSTAT M3x5
Page 61
10.11.2 Relay output module (8 channels)
The Relay output module is a relay switch. Its main purpose is to be used as an alarm
output.
For the Relay output module in Auxiliary I/O modules A & B, only a single alarm can be
connected to each output, whereas with the Relay output module in Main I/O module 1 or 2,
a combination of alarm groups can be connected to each output to trigger it.
For more information on Alarms see section 10.13.
10.12 RTC Synchronization module C
In order to use Module C for synchronisation purposes it has to be defined as a
synchronisation source.
CAUTION
RTC synchronisation is an essential part of a Class A instrument. If no proper RTC
synchronisation is provided the device operates as a Class S instrument.
Quality Analyzer M3x5 supports three types of RTC synchronization:

GPS time synchronisation (via Synchronisation module C)

IRIG-B time synchronisation (via Synchronisation module C)

SNTP time synchronisation (via Ethernet)
Instructions regarding connection of Synchronisation module C can be found in section 8.9.
PLEASE NOTE
Serial communication built into Synchronisation module C can, under certain conditions, be
used as an independent secondary communication.
10.12.1 GPS time synchronization
For proper GPS synchronisation two signals are required.

1PPS with TTL voltage level and

NMEA 0183 coded serial RS232 communication sentence
GPS interface is designed as 5 pole pluggable terminal (+5V for receiver supply, 1PPS input
and standard RS232 communication interface).
Proposed GPS receiver is GARMIN GPS18x
PLEASE NOTE
When connecting a GPS modem to the serial RS232 communication interface please take
into consideration the required communication parameters. For the proposed GPS receiver
the default communication speed is 4800 b/s.
10.12.2 IRIG time code B (IRIG-B)
Un-modulated (DC 5V level shift) and modulated (1 kHz) serial coded format with support for
1PPS, day of year, current year and straight seconds of day as described in standard IRIG-
200-04.
Supported serial time code formats are IRIG-B007 and IRIG-B127.