GE Hydran 201i, Instruction Manual

Page: 94 / 300

Chapter 4 • Hydran 201T
i
’s Displays and Menus
4-22 Rev. 6, March 2011 Part 17997
Note: The H201Ti’s microprocessor only gives access to one channel at a time.
4.5.6.2 CommMode
This function is used to select the communication mode between the Hydran 201T i and the
Hydran Host software. There are two possibilities:
• Call OnAlarm : In this mode, the H201T i communicates with the Hydran Host through
a telephone line when a gas or fail alarm condition is detected. The operation of this
mode can be tested using the
Communication;Force HostCall command (see
Section 4.5.6.4 on page 4-22). The frequency and number of call attempts meet the
normal regulations of telephone companies.
• AnswerOnly : In this mode, the H201T i remains inactive until being questioned by the
host computer running the Hydran Host or any other SCADA system.
4.5.6.3 BaudRate
This function is used to set the serial communication rate of the Hydran 201T i . The
communication can be set at 1,200, 2,400, 4,800 or 9,600 bps (bits per second). All
H201T
i ’s belonging to one network must be set to the same baud rate.
If the BaudRate parameter is changed and if the H201C i Controller is equipped with a
modem, always execute the Communication;Force HostCall command (see
Section 4.5.6.4 on page 4-22) immediately after the modification.
Note: The communication rate of the H201Ti’s must be the same as the one set in the
Hydran Host software (see the Hydran Host Software Manual).
4.5.6.4 Force HostCall
This function is used to perform two actions:
• To initialize the modem in the H201C i Controller with the communication rate selected
using the BaudRate parameter.
• To test the communications between the Hydran 201T i and the Hydran Host software by
forcing the H201C i Controller’s modem to call the modem of the host computer where
the Hydran Host is running.