I've got a question about remote code 232 emulation eg:

Zone 1 V+, V-, M1, M0 with sums:
0,1,49,PUT,System(Remote_Signal(Receive(Code=7A851AE5))),144\n
0,1,49,PUT,System(Remote_Signal(Receive(Code=7A851BE4))),144\n
0,1,49,PUT,System(Remote_Signal(Receive(Code=7E81A25D))),144\n
0,1,49,PUT,System(Remote_Signal(Receive(Code=7E81A35C))),144\n

How fast (time space between repetitions) can I send volume up and down so I can make a regular remote just ramp the volume up and down? When I tried sending the commands through a terminal program at roughly half second intervals I'd get error messages. Is it more reliable from a control system?