Table 6-7: Communications port parameters RS-232 receive-only mode
SerialOpenFormat
Parity
No. stop bits
No. data bits
64
None
1
8
65
Odd
1
8
66
Even
1
8
67
None
1
8
68
Not used
69
Odd
2
8
70
Even
2
8
71
None
2
8
72
Not used
73
Odd
1
7
74
Even
1
7
751
None
1
7
76
Not used
77
Odd
2
7
78
Even
2
7
79
None
2
7
1
This mode is only supported if there is at least a one-bit delay between characters received by the SDM-SIO1A.
6.3.1.2 SerialClose()
This will place the SDM-SIO1A unit into shutdown mode where only SDM communications will
operate. This means any data coming into the SDM-SIO1A on the RS-232/RS-485 interface will
be lost.
This is the lowest possible power mode, and for optimum power efficiency, the SDM-SIO1A
should be placed in this mode whenever possible.
6.3.1.3 SerialIn()
The primary difference when using this instruction with an SDM-SIO1A compared to when it is
used with a serial port built into the data logger is timing. If the data has already been sent by the
remote sensor/system, the instruction will run in a few tens of microseconds as the data is read
SDM-SIO1A and SDM-SIO4A Serial Input/Output Modules
22
