Technical Specifications
A.2 Transmission Rates
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
218 Manual, 09/2008, A5E02191071-01
A.2 Transmission Rates
Transmission Rates
The tables below indicate the transmission times required depending on the transmission
protocol selected.
Two S7-300 stations, each with a CPU 315-2DP (6ES7315-2AF01-0AB0) and a CP 341
were used to measure the times. An P_SND_RK function block was programmed in the user
program of the active CPU, and an P_RCV_RK function block was programmed in the user
program of the passive CPU. The time that elapsed between the initiation and completion of
the request was measured.
ASCII driver
Table A- 10 Transmission times for the ASCII driver
Baud rate (bd) User data
76800 57600 38400 19200 9600 4800 2400 1200 600 300
1 bytes 0.010 s 0.010 s 0.010 s 0.010 s 0.010 s 0.010 s 0.020 s 0.039 s 0.077 s 0.154 s
10 bytes 0.010s 0.010 s 0.010 s 0.020 s 0.020 s 0.031 s 0.062 s 0.131 s 0.251 s 0.492 s
20 bytes 0.011 s 0.013 s 0.020 s 0.020 s 0.030 s 0.055 s 0.110 s 0.220 s 0.431 s 0.853 s
50 bytes 0.020 s 0.026 s 0.030 s 0.040 s 0.080 s 0.140 s 0.251 s 0.492 s 1.000 s 2.000 s
100 bytes 0.035s 0.043 s 0.050 s 0.090 s 0.150 s 0.258 s 0.491 s 0.952 s 2.000 s 4.000 s
200 bytes 0.060 s 0.082 s 0.100 s 0.160 s 0.271 s 0.501 s 1.000 s 2.000 s 4.000 s 8.000 s
500 bytes 0.145 s 0.191 s 0.206 s 0.357 s 0.651 s 1.213 s 2.400 s 4.800 s 9.600 s 18.800 s
1000 bytes 0.261 s 0.335 s 0.402 s 0.692 s 1.263 s 2.400 s 4.800 s 10.600 s 21.200 s 37.600 s
3964(R) procedure
Table A- 11 Transmission times with the 3964(R) procedure
Baud rate (bd)
User data
76800 57600 38400 19200 9600 4800 2400 1200 600 300
1 bytes 0.010 s 0.010 s 0.011 s 0.020 s 0.020 s 0.027 s 0.042 s 0.076 s 0.139 s 0.271 s
10 bytes 0.011 s 0.016 s 0.020 s 0.020 s 0.030 s 0.050 s 0.083 s 0.158 s 0.305 s 0.600 s
20 bytes 0.021 s 0.021 s 0.021 s 0.031 s 0.040 s 0.071 s 0.129 s 0.251 s 0.490 s 0.969 s
50 bytes 0.027 s 0.029 s 0.030 s 0.050 s 0.080 s 0.142 s 0.272 s 0.528 s 1.000 s 2.000 s
100 bytes 0.041s 0.046 s 0.051 s 0.081 s 0.145 s 0.262 s 0.506 s 0.993 s 2.100 s 4.000 s
200 bytes 0.060 s 0.077 s 0.090 s 0.151 s 0.272 s 0.500 s 1.000 s 2.000 s 4.200 s 8.000 s
500 bytes 0.129 s 0.175 s 0.202 s 0.351 s 0.642 s 1.220 s 2.400 s 4.800 s 9.600 s 18.800 s
1000 bytes 0.251 s 0.297 s 0.342 s 0.681 s 1.260 s 2.415 s 4.800 s 10.600 s 21.200 s 37.600 s
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