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D.4
Read only Commands
Code: 10 Description: Read Process Value
Table D- 1
Command
SOH (0x01)
Meter
Address
Table D- 2
Reply
STX
'1'
'0'
(0x02)
The reply data is nine characters consisting of a relay status character, followed by 'U'
(Under Range), 'O' (Over Range), 'P' (Open), '+', or '-' followed by a number string including
a decimal point, if it is selected for display. The number string is always seven characters,
consisting of either six digits and a decimal point, or six digits with a leading zero if no
decimal point is selected. The Open character indicates an overrange condition for a
temperature input. The relay status represents the energized or de-energized state of the
relay(s), and is active low logic (status 0 = relay energized).
Relay Status Character
Relay 2
On
On
Off
Off
Code: 11 Description: Read Maximum Process Value
Table D- 3
Command
SOH (0x01)
Meter Address
Table D- 4
Reply
STX (0x02)
'1'
'1'
The reply data format is eight characters consisting of '+' or '-' followed by a number string.
The number string is always seven characters, consisting of either six digits and a decimal
point, or six digits with a leading zero if no decimal point is selected.
SITRANS RD200
Operating Instructions, 05/2019, A5E47629414-AA
Meter
'1'
Address
Relay
'U'
n
n
Status
'O'
'P'
'+'
'-'
Meter Address
'+'
n
n
'-'
'0'
n
n
n
Relay 1
On
Off
On
Off
'1'
'1'
n
n
n
n
'9'
'F'
n
n
Check
Check
sum
sum
Hex character
0
1
2
3
'9'
'E'
n
Checksum Checksum
ETX (0x03)
ETX
(0x03)
ETX (0x03)
ETX
(0x03)
65
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