06160J DCN7969
Teledyne API Model 465M O
3
Monitor User Manual
25
4.5.4.
Hi-Current Relay Outputs
Three form C relay outputs are provided on the rear panel on the nine pin connector (See
Figure 4-5). The relays are labeled “Relay 1,” “Relay 2,” and “Relay 3.”
The relays are dry contact type form C (SPDT) relays with Normally Open (N.O.),
Normally Closed (N.C.) and Common (COM) contacts. The relays are capable of driving
loads of up to 250VAC, 5A. For maximum contact life, the relays should only be used to
drive resistive loads. Contact life may be dramatically shortened if inductive loads are
driven without any provision for minimizing high voltage “inductive kick” that can occur.
See Section 7.2.6 to configure the concentration for the alarm trigger.
Table 4-4: Relay Functions
Relay #
Function
Normal
Operating State
1
System OK Diagnostic
(Identical to Sensor OK
status output as
described in Table 4-3)
On
2
Hi Alarm
Off
3
Hi-Hi Alarm
Off
4.5.5.
Digital Serial Interfaces
There is one external communications port available on the 465M that can be configured
as RS232, RS485 (Half Duplex,) or Ethernet (10Mbit.) This section provides only a brief
overview of the digital serial connections; for more detailed information on configuring
and using the digital serial interfaces, see Section 8.
4.5.5.1.
RS232 Connection
With the instrument configured for RS232, connection can be made to the DB-9
connector, labeled “RS232/485”, or to the three “COM” pins on the “General I/O”
connector. See Section 8.2 for additional details.
When using RS232, a 9-pin serial cable (TAPI P/N WR77) can be used to connect the
instrument to a standard PC (personal computer) serial port.