User guide
Command/response table for SIS commands
Command
ASCII Command 
(host to switcher)
Response 
(switcher to host)
Description
Switcher-
initiated 
messages
Input selection (in separate switcher mode only)
Select video and audio input
X!
 * 
X@
 ! Chn 
X!
 * 
X@ ]
  Group 
X!
 and input 
X@
 are 
selected. 
X!
 = Group 1 through 4 
(1 = VGA, 2 = DVI, 
3 = HDMI, 4 = Composite). 
X@
 = Inputs 0–2 (0-3 for HDMI) 
for each group (input 0 = off).
X
Input selection (in single switcher mode only)
Select video and audio input
X1!
 ! Chn 
X1!
] X1!
 = Inputs 0 through 9 for 
single input addressing, 
X1!
 = (
X!
 - 1) times 4 + 
X@
.
Switcher mode select
Select switcher mode
X&
 *1# Mod 
X&
 ]
X&
 = switcher mode:
1 = Single mode (default) 
DVI/HDMI combine disabled, 
2 = Single mode DVI/HDMI 
combine enabled, 
3 = Separate mode, DVI/HDMI 
combine disabled, 
4 = Separate mode, DVI/HDMI 
combine enabled.
View switcher mode 1 #
X&
 ]
Input EQ (DVI and HDMI inputs only
Adjust input EQ (per input)
EX!
*
X@
*
X# 
ISEQ
}
X!
•
X@ 
ISEQ•
X# ] X# 
= 0 (low, +6 db), 
X# 
= 1 (high, +18 db)
View input EQ setting (all 
supported inputs
E 
ISEQ
}
ISEQ
•X#•X#•X#•X#•X#]
Program Audio Breakaway
Select program audio input
X!
 * 
X@ 
$ Pra 
X!
 * 
X@
]
Selects any input from any 
group to be routed to the 
program audio output. 
X!
 = group 1 through 4 
(1 = VGA, 2 = DVI, 
3 = HDMI, 4 = Composite 
Video). 
X@
 = inputs 0 through 2 (0–3 
for HDMI) for each group (input 
0 = off).
X
Program audio gain/attenuation
Set gain to specific value
X1!
*
X1$ 
G In
X1!
•Aud
X1#]
Set attentuation to specific value
X1!
*
X1% 
g In
X1!
•Aud
X1#]
Increment level of specific input
X1! 
+G In
X1!
•Aud
X1#]
Decrement level of specific input
X1! 
–G In
X1!
•Aud
X1#]
View audio level of specific input
X1! 
G
X1#]
MPS 409 • SIS Programming and Control 23










