Product manual

CAD Interface Installation
64 025-9158L
Response Data Packets (From Model 26)
The three Response Data Packets are Station Partial Status (03), Station Input (Alarm)
Status (0A), and Station Full Status (0C).
Byte 1 2 3 4 5 to n n+1 n+2
STX LLSEQ# HLSEQ# RESP# DATA BYTES ETX CHKSUM
Hex 02 00 or FF 00 to FF
03,0A,0C
See Note 1 03 00 to FF
Note 1: See Text - A Special Case on page 68
Response Text Packet (From Model 26)
The Response Text Packet is Text Flow Control (0D).
Byte 1 2 3 4 5 6 7
STX LLSEQ# HLSEQ# RESP# SUSP/RESUME ETX CHKSUM
Hex 02 00 or FF 00
0D
00 or NZ 03 00 to FF
High Level ACK/NAK (From Model 26)
The High Level ACK/NAK takes the form of a response data packet with only one data
byte which is either non-zero for ACK or zero for NAK. When the CAD sends a packet,
it must wait for a High Level ACK before assuming that the packet (command) actually
reached the Model 6 in the station even though the resultant status change from the
Model 6 may precede the High Level ACK. (This is due to timing and transmit delays
from the Model 26.)
Byte 1 2 3 4 5 6 7
STX LLSEQ# HLSEQ# RESP# ACK or NAK ETX CHKSUM
Hex 02 00 or FF 01 to FF
09
NZ or 00 03 00 to FF
Undefined Command Number (From Model 26)
The Undefined Command Number packet also has only one data byte, which is the
command number, which was not defined. This response occurs when the Model 26 does
not recognize the command sent by CAD. (This response should only be seen when
developing software on the CAD system).
Byte 1 2 3 4 5 6 7
STX LLSEQ# HLSEQ# RESP# UNDEF. CMD# ETX CHKSUM
Hex 02 00 or FF 01 to FF
FF
?? 03 00 to FF