FSR IT-VCM - Manual (Page 16)

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The second device seeing the "}" would process the request and send the message within the double
quotes, with the ASCII hex (<CR>) replaced with the actual hex characters (R 1 1 0D) to the third
device (which may be an FSR IT-R4S). Since the message to the third device hasn’t a drop
preamble it would handle the relay request.
Responses
Responses from the downstream device will just be passed up; the addition of the drops will only
make for more complex and harder parsing for the control system. The characters will be assembled
into messages and sent up as they come in. If a message doesn’t have a terminator (<CR>, <00>,
etc.) the receiver will time out after 1.5 seconds of receiver inactivity and send that message up.