Rockwell Automation T3151 ICS Regent Real time Clock Communications Modules - Manual (Page 8)

Real-Time Clock Communications Modules (T3151)
8
Industrial Control Services
Table 1. Real-Time Clock System Registers.
Unit Read Clock
Tag Name Set Clock
Tag Name
Year RTCYEAR SETYEAR
Month RTCMNTH SETMNTH
Day of Month RTCDOM SETDOM
Day of Week RTCDOW SETDOW
Hour RTCHOUR SETHOUR
Minute RTCMIN SETMIN
Second RTCSEC SETSEC
Millisecond RTCMS (always set to 0)
Communication Port Connections
Each communications port has a DB-25, female connector on
the front of the module. The RS232 signals are internally
connected to the DB-25 connector pins listed in Table 2.
Table 2. Communications Port Pin-out.
Signal Pin
TXD 2
RXD 3
GND 7
Typically these ports are used to connect to a communications
device located within 150 feet of the system. For longer
distances, external modems or signal converters may be used.
Since the module only provides RS232 interface connections,
external signal converters (RS232 to RS422/485) are required
if the module is to be connected in multidrop configurations.
These configurations may include Guarded Peer-Link to other
Regents or multidrop networks to a central PC, Man-Machine
Interface or other communications devices (that support the
Regent R2 or Modbus RTU protocols).