HELIX GRANVILLE-PHILLIPS Convectron ATM, Instruction Manual

Page: 52 / 98

Chapter 4
44
Convectron
®
ATM Vacuum Gauge Module Instruction Manual
Baud rate
The example set baud rate (SB) command sequence sets the baud rate to
2400 baud:
Example SB command from host: #01SB2400
↵
Response from module: *01 PROGM OK
↵
Allowable SB values are 1200, 2400, 4800, 9600, 19200 (default), or
38400 baud.
The response time from the module depends on the baud rate and the task
that the host commands the module to perform.
• Table 4-5 on page 44 lists baud rates and corresponding response times.
• Table 4-6 on page 44 lists the additional time required for the module to
respond to each command type.
Use the following equation to calculate the total response time for each type
of task listed in Table 4-6.
The module driver automatically shuts OFF 80
µ
sec after returning its
response to the host.
Table 4-5 Baud rates and module response times
Baud rate Module response time (msec)
1200 baud 22 msec
2400 baud 13 msec
4800 baud 7.5 msec
9600 baud 5.1 msec
19200 baud (default) 3.9 msec
38400 baud 3.3 msec
Table 4-6 Response time per command type
Command type Module response time (msec)
Reset to programmed values No response time
Read 0 msec
Program relay 17 msec
Set 17 msec
Perform calibration 17 msec
Report firmware version 17 msec
Reset parameters to factory defaults 105 msec
Response time Time
Baud rate
Time
Task
+ =