Owner's manual

Table Of Contents
Equipment-to-Host Messages 2-1
2. Message Summary
This section covers the primary SECS messages sent and received between the Host and the Equipment.
2.1 Host-to-Equipment Messages
Table 2-1 describes primary SECS messages sent by the Host, and the associated reply messages from the
Equipment.
The CState column indicates the control state the Equipment must be in to accept the message. The
current value of the Equipment Control State can be found in variable CONTROLSTATE (VID 4).
Possible control state values for this column are listed in Table 2-2.
Unlawful messages sent to the Equipment while Control State is Off-Line (1, 2, or 3) will be replied to
with a SnF0 message. Thus, the Host will see only values of 4 or 5 for CONTROLSTATE.
Refer to Table 7-1 for further message detail.
In the Notes column, those messages marked with “E” are extensions beyond GEM. Those messages
marked with “N” are provided for non-GEM or older GEM compatibility.
Table 2-1 SECS Messages – Host-to-Equipment
Primary Reply CState Description Notes
S1F1 S1F2 4,5 Are You There
S1F3 S1F4 4,5 Selected Status
S1F11 S1F12 4,5 Status Variable Namelist Request
S1F13 S1F14 All Connect Request
S1F15 S1F16 4,5 Request Off-Line
S1F17 S1F18 1,2,3 Request On-Line
S1F65 S1F66 All Connect Request N
S2F13 S2F14 4,5 Equipment Constant Request
S2F15 S2F16 4,5 New Equipment Constant Send
S2F17 S2F18 4,5 Date and Time Request
S2F21 S2F22 5 Remote Command N
S2F23 S2F24 4,5 Trace Initialize
S2F25 S2F26 4,5 Loopback Diagnostic E
S2F27 S2F28 5 Initiate Processing Request N
S2F29 S2F30 4,5 Equipment Constant Namelist Request E
S2F31 S2F32 4,5 Date and Time Send
S2F33 S2F34 4,5 Define Report