Micromod Micro-DCI: 53IT5100A Indicator/Totalizer User Manual
Page 74
B.1.6 SOFTWARE CHARACTERISTICS
1.
Transparency Rule - whenever 7E hexadecimal is transmitted as anything other than
SOH, a 00 byte will be inserted directly following it (byte stuffing).
2.
All transactions are initiated by the Host or SUPERVISOR-PC.
3.
All instruments begin their response within 10 ms after the end of the transmission by
the Host or SUPERVISOR-PC; otherwise, a faulty transmission may be assumed.
4.
Illegal messages received by the instruments are ignored.
5.
The host must acknowledge the instrument’s response to a CHANGE REQUEST within
100 ms or the request is ignored.
6.
A break of 100 ms in a message causes the instrument to ignore the part of the mes-
sage before the break.
7.
The maximum number of data bytes per message is 32 (decimal).
B.1.7 HARDWARE CHARACTERISTICS
1.
Transmission Speed - standard rates are 300 - 28800 baud.
2.
Asynchronous by character.
3.
A character is:
1 Start bit.
8 Data bits - the Least Significant Bit (LSB) is transmitted first.
1 Even Parity bit.
1 Stop bit.
4.
Line is 4-wire, shielded twisted pair, type RS-422/485.
53IT5100 Indicator/Totalizer
B-8