Communication Protocol - GE Hydran 201i Instruction Manual

Hydran* 201i Instruction Manual
In the Call OnAlarm mode, the following actions are performed when an alarm is
triggered:
• The H201Ti sends the ATDS0 command through the selected communication
channel (USB or supervisory link; see the CommChannel and DefaultChannel
parameters in the Communication submenu).
• The Hayes-compatible modem receiving this command dials the telephone
number previously stored in its register 0; this number is redialed until the
connection with the host computer's modem is established. Then, no other
message is sent; the host computer has the responsibility to communicate with
the H201Ti in alarm.
• The Hydran Host software answers and receives the alarm message.
• The Hydran Host software displays the alarm states and updates its data bank.
• The user must acknowledge the alarm in the Hydran Host software and take the
appropriate measures.
Note:
1. This functionality is only supported in Hydran protocol and Hydran Host PC application.
It is not supported by Perception software (when Hydran 201Ti is set to Modbus protocol)
2. It might take up to 15 min after the alarm is generated in the H201Ti for the Call
OnAlarm to the Host software to occur.
2. Acknowledging the alarm in the Hydran Host software does not turn off the illuminated
push-button of the Hydran 201Ci-1 Controller.

10.4 Communication Protocol

Hydran 201Ti only supports serial communications and for this type of connectivity,
General Electric Canada uses its own protocol – Hydran protocol, and starting with the
CPU FW v4.0, it also supports standard Modbus RTU protocol (see Appendix I). In the case
of the Hydran protocol data is transmitted in ASCII codes; data clusters being
transmitted are verified and, if necessary, transmitted again.
MA-033 Rev. 14.0, 12-Nov-18
Page 151