Table 5-27: ASCII RS-232 Output connector pin assignments
ASCII RS-485 and Alarms/Relays Specifications
Inputs/Outputs
: (2) Two contact relay connections (NC, common, NO)
Signal Type and Connector
: Terminal block
Contacts Switch under max. load of 30 V
DC
, 2A
Contacts rated to switch 220 V
DC
Breakdown voltage of 1000 V
DC
between contacts
Switch time 4ms, max.
RS-485 Differential Output:
+1.65 V Typical Common Mode Output Voltage
2V min Differential Output Voltage Swing with 100 Ω load,
3.3 V Differential Output Voltage Swing, No Load, with ESD pro-
tection
Pin Assignments
Figure 5-63: RS-485 connector "J3"
Connector
Pin
Signal Direction Characteristics
1 RS-485 TX+ Out 0V to 3V
DC
differential, 120 Ω load
2 RS-485 TX- Out 0V to 3V
DC
differential, 120 Ω load
3 GROUND N/A GROUND
4 Relay 1 NO Out Normally Open 30 V
DC
, 2A max.switching
power
SecureSync 2400 User Manual 535
APPENDIX
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