DL8000 Preset Instruction Manual
D-2 Communications Protocols Revised February-2016
delivery operations. All command codes can be used. You can
request status information and control preset operation.
Manual [value = 1]: The TAS maintains bi-directional
communications with the preset and monitors of batch delivery
operations. The TAS cannot control batch operation in this mode.
Consequently, only certain command codes (which are not for batch
control) can be used. You can request status information.
Table D-1 (in Section D.3, Communications Commands) lists the
commands supported in each protocol and the operating modes in which
they are valid.
Definitions/Acronyms/Abbreviations
This appendix uses the following acronyms:
BCC
Block check character
FCV
Flow control valve
K&D
Keyboard and display
ROC
Remote operations controller
TAS
Terminal Automation System
D.1.1 Communication Channels
A TAS communicates with a preset using any of four comm ports:
COMM2 [63,0,32], COMM3 [63,0,49], COMM4 [63,0,139], or
COMM5 [63,0,149]. Each port has the following possible values: 0
(use no protocol), 1 (use Modbus protocol), or 2 (use DanLoad 6000
protocol).
Note: You can use Modbus simultaneously on more than one port. Use
ROCLINK 800’s Comm Ports screen (ROC > Comm Ports)
and select the Modbus Slave Only option to set the port owner
[95,x,43] as Modbus slave only [=51].
Unlike the Modbus protocol, the system supports the DanLoad 6000
protocol on only one serial port at a time. It recognizes and uses the first
port you configure for the DanLoad 6000 protocol.
D.1.2 Communications Failure
If you have configured a comm port for either Modbus or DanLoad
6000 protocol and the TAS is in automatic mode, the system scans for
communications failures. It raises an alarm when the DL8000 does not
receive a valid request on the specified comm port within the configured
time.
Note: You configure this timeout value using the Port 2 Timeout
through the Port 5 Timeout fields on the Preset Setup screen’s
General tab.
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