Atest Gaz ProGas 4, Руководство пользователя

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4.1.2 Teta Bus digital communication port
Figure 6: Electric connections for the option with the Teta Bus port
Port designation Name Pin Description
X1 TETA BUS -, + Combined transmission and power supply lines
4-20 S 4 – 20 mA current output
X2 R1.1 – R3.2 Relays terminals
Table 4: Connections diagram for the option with Teta Bus port
4.2
RS-485
Communication via the RS-485 employs either the Modbus ASCII or the Sigma Bus protocol (when the
detector communicates with other devices of the Sigma system).
Detectors provided with the RS-485 port transmit output signals in the digital form (see Appendix [4]). Each
detector provides information about its status by transmission of the following parameters:
result for measurements of gas concentration expressed as percentage ratio of the full range,
information whether warning /alarms thresholds are exceeded or not,
status details, e.g. possible failures or defect, etc.
4.3 Current output
4.3.1 Operating modes – direction of current flow
The current output can be used in two modes: sink or source. The diagram below explains how to connect
the detector for each of the operating mode.
Figure 7: Connection of a gas detector according to the direction of current flow
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User Manual: POD-064-ENG R05
-
+
S
A
Source
-
+
S
A
Sink
R
OBC
U
S