ICP DAS USA ICP CON GW-7557, Руководство пользователя

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GW-7557 PROFIBUS/HART Gateway User Manual
(Version 1.00, Dec/2011)
PAGE: 34
GW-7557 module will all be cleared.
Bit 1~7
：
The remaining bits have to be set to zero.
●
Output HART Command module select (byte 2)
If HART Frame Format is “Compact”, when this byte isn’t ‘0’ and the
user change data output command (byte 0), it will trigger single data
output command of the HART Command module (Output Mode is
Manual) and this byte represent module address of the output module (ex:
“byte 2”=3, it represent that the user want to trigger data output
command of the third module )
●
Output HART channel (byte 3)
If HART Frame Format is “Transparent”, user can set the HART
channel for HART command. The range is 0~3.
●
Output preamble length (byte 4)
If HART Frame Format is “Transparent”, user can set the preambles for
HART command. The range is 5~20.
●
Output HART frame length (byte 5)
If HART Frame Format is “Transparent”, this byte represent frame
length of HART frame (exclude preamble length and check byte; ex:
send command 0 by using short frame, “byte 5”=4, it represent that
delimiter
(1 byte)+short address(1 byte)+command number(1 byte)+byte count(1
byte)).
4.7 Establish connection with GW-7557
Before establishing a connection between the DP-Master and the GW-7557, user
should execute the following steps first, as shown in
Figure 22
.