User manual

COMMUNICATION PROTOCOL
C
117
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Block Check Characters
VALUE SERIAL COMMAND
LRCC 0 = 30
16
Checksum 256
1 = 31
16
Disable none = 20
16
When this parameter is enabled all data transmitted to host computer or Formula
terminal is completed by Block Check Characters that carry out a transmission check.
If transmission is successful the receiving instrument sends an ACK character. By
contrast if transmission occurs with a wrong checksum, the receiving instrument
replies with a NAK character.
It is advisable to always define the Block Check Characters when connecting host
computer to Formula terminal because this is the only way to check that data is not
lost or corrupted during transmission (refer to the paragraph entitled
“Communications frame”).

Characters Delay
This parameter defines the time the Formula terminal waits before transmitting the
next character.
This delay must be defined as a one-digit number from 0 to 9 and is calculated as:
Delay sec.
50
= (command data) msec.
For example, set command data to “9” to obtain a Delay of 0.45 seconds:
0,45 sec.
50
= 9 msec.