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: 33

Data input command (byte 12)
The capacity of Output Queue is from 1 to 255. One level means there are
level*2 or level*2-1 HART command in the Output Queue. (ex: level 5
means there are 9 or 10 HART commands in the Output Queue)
4.6.2 Output data area and communication command
The maximum length of output data is 240 bytes. Before arrange the output
module, the user must arrange and configure the system setting module. The
first six bytes belong to communication commands, as shown in
table 13.
Table 10
Output data area
Module Byte Data Description
0 Data Data output command
1 0x01 Control bit
2 Data Output HART Command module select (for Compact)
3 0~3 Output HART channel (for Transparent)
4 5~20 Output preamble length (for Transparent)
System
Setting
module
5 Data Output HART frame length (for Transparent)
Output
module
Or
HART
Command
module
6~239 Data Output data
●
Data output command(byte 0)
When this byte is changed, PROFIBUS Master device will send data of
output module to Output Queue of GW-7557 and then GW-7557 will
send HART frame to HART slave device.
PS: When the user use this byte to trigger “data output command”, the
user must increase this byte in order (ex: 0->1, 1->2,…, 255->0) or else
the GW-7557 will send a diagnostic message to the PROFIBUS master
(please refer section 4.5 Diagnostic messages).
●
Control bit(byte 1)
Bit 0
：
When this bit is set to 1, diagnostic messages sent by the