WT.050.560.001.UA.IM.0714
81
Depolox
®
3 plus ReSIDUAl ANAlYZeR
eVoQUA
W3T140188
3.7.3
Specification of Bus Interface
1 Synchronization mode:
Asynchronous
2 Transmission rate:
19200 Baud
3 Data format (asynchronous):
- Start bit:
1 Bit
- Data bit:
8 Bit
- Parity bit:
even
- Stop bit:
1 Bit
4 Signal polarity:
Differential voltage interface
Logical “1” = (A-B >= 0.2V)
Logical “0” = (A-B <= -0.2V)
5 Handshake:
No handshake because of request
control with fixed blocks
6 Transmission code:
Evoqua Water Technologies-
Protocol (master-slave)
multipoint communication,
maximum 32 users
7 Galvanically not isolated
3.7.4
Transmission Protocol
For the communication between master (active user, e.g., computer) and slave
(passive user), two different kinds of frames are used:
• Request - Frame
• Set - Frame
The slave answers to these frames with the following frames:
• Answer frame
• Positive confirmation
• Negative confirmation
The bytes of these frames always have the same formats:
• 1 Start bit (always “0”)
• 8 Data bits
• 1 Parity bit (even)
• 1 Stop bit (always “1”)
Summary of Contents for Wallace & Tiernan Depolox 3 plus
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