Lightspeed CAT 860, Руководство пользователя

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34
1. Overview
2. Setup & Use
3. Optional
Accessories
4. T
roubleshooting
5. W
arranty
, Safety
& Specifications
Control Character Hex Value and Definition
STX (0x02) Start character of an action command packet.
EOT (0x04) End character of any command packet.
ACK (0x06) Only response character from the CAT 860
if action command (PING command only) is
properly received and accepted.
NACK (0x15) Only response character from the CAT 860 if
any command is corrupted or unsupported.
The CAT 860 should send a NACK if:
1. The CAT 860 can not recognize the start or
command characters.
2. The CAT 860 does not receive an end
character after receiving a total of twenty
characters after receiving valid start and
command characters.
3. The CAT 860 does not receive an end
character after waiting 50ms after receiving
valid start and command characters.
CMD (find hex value
from Table 1) This is the general symbol for the command
character derived from Table 1.
Param (find hex value
from Table 1) This is the general symbol for the parameter
character(s) associated with the command
character. They are derived form Table 1.
13. RS-232 SERIAL INTERFACE
PROGRAMMING
CONT’D
General Format for Action Command Exchange for Basic and Advanced
Command Set:
In this example, the serial controller sends an action command packet to the
CAT 860 and in response the CAT 860 repeats back the action command packet
the serial controller. The <Param> characters can be absent from the action
command packet, but all response packets will have one or two added <Param>
characters containing the values of the pertinent internal CAT 860 register.
Controller: <STX><CMD><Param><EOT>
CAT 860:
<STX><CMD><Param><EOT>