Ametek 5000 Instrument Manual page 61

Read & Write Protocol
For a single controller, the serial address (RS485_Address) is 200; for networked controllers, addresses
from 201 to 232 are used. When multiple analyzers are networked, the address of a specific analyzer
must precede the first of a string of read/write commands destined for that analyzer. Press and hold
the [ALT] key while entering the 3 digit serial address. If there is doubt about which of the networked
controllers is on line at a given time, type [WHO] and the active controller will respond with its serial
address.
Read commands consist of the letter R (upper or lower case) followed by the two character alphanu-
meric ID code for the system value. Refer to Table III for Read Only variables and ID Codes. For ex-
ample, to read the current value of cell frequency (Cell_Freq) from analyzer 201, the command would
be [ALT]+[2] [0] [1] followed by R03.
Write commands consist of the letter W (upper or lower case) followed by the two character alphanu-
meric ID code for the variable and the data to be written to the EPROM. The data field has a floating
decimal format and must not exceed eight characters; plus and minus signs and trailing zeros are per-
mitted but not required. Valid data values range from -0.00001 to +999999. Refer to Table IV for Read
and Write variables and ID Codes. For example, to write a new value of 2.5 to Max_Span on analyzer
201, the command would be [ALT]+[2] [0] [1] followed by W342.5.
Real Time System Values
System Value
Point 1 ppm
Point 2 ppm
Point 3 ppm
Point 4 ppm
Roll Points
Current_ppm
Cell_Freq
Delta_Freq
Cal_Err
Countdown Timers
System Value
Cal_timer
Per_timer
Cal_Cycles
Equil_Cycles
CurAutoCal
Sample_Point
Table III: Read Only System Values
Serial ID Description
01 Last calculated moisture, Point 1
02 Last calculated moisture, Point 2
03 Last calculated moisture, Point 3
04 Last calculated moisture, Point 4
05 Last moisture 1
06 Current live moisture including Equil, Cal, and Zero
07 Current Cell Frequency (Hz)
08 Current Delta Frequency (Hz)
13 Current Calibration Error (if error condition exists)
Serial ID Description
14 Seconds remaining in verfication cycle
15 Seconds remaining in current period
16 Cycles remaining in verfication period
17 Cycles remaining in equilibration period
18 Days remaining until next auto-cal cycle
19 Number of current sample point (1
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2
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Serial Communication 5-3