Granville-Phillips Micro-Ion 354 E Series, Instruction Manual, Page: 29 / 54

RS–232 Operation
Micro-Ion E Module Instruction Manual 354011, Rev. A
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Figure 5-1 Data Timing and Response Delays
Table 5-4 Data Timing and Response Delay Limits
Timing Segment Time Limit
Time T 2 msec minimum
18 msec maximum
Time D 300
μ
sec maximum
Time H Depends on baud rate and command type. Use the following
equation to calculate the total response time for each task
listed in Table 5-5:
Table 5-5 Response Time per Command Type
Command Response Time in msec (Time H)
IGS (read Micro-Ion E gauge status) 3.3 msec
RD (read pressure) 3.3 msec
VER (read module firmware version) 3.3 msec
RS (read module status) 3.3 msec
UNL (unlock interface functions) 21 msec
TLU (toggle locked functions) 21 msec
SB (set baud rate) 21 msec
SO (set overpressure limit) 21 msec
IG (turn Micro-Ion E gauge ON or OFF) 21 msec
FAC (reset default baud rate) 109 msec
RST (reset values to factory defaults) • No response
• Communication resumes after 2 sec
Response time Time
H
Time
T
+ =