CommsMode

This optional parameter is left blank when used with the SDM-SIO1A or SDM-SIO4A. The CommsMode specifies the configuration of the datalogger's control port used by this instruction. The ports can also be configured using Device Configuration Utility. Configuring the ports using the SerialOpen instruction will change the setting if it was previously set by other means.

Code

Description
01 Configures the port as RS-232, ± 5V voltage levels (ComC1-ComC7 on CR1000Xe; ComC5-ComC7 on CR1000X; and CPI/RS-232 )
1 Configures the port as TTL, 5V and 0V voltage levels ( ComC1-ComC7)
2 Configures the port as LVTTL, 3.3V and 0V voltage levels ( ComC1-ComC7 )
3 Configures the port as RS-485 half-duplex, PakBus communication (ComC1, ComC3, ComC5, or ComC7; Odd ports = A-; Even ports = B+)
4 Configures the port as RS-485 half-duplex, transparent (ComC1-ComC7 only; Odd ports = A-; Even ports = B+)
52 Configures the port as RS-485 full-duplex (ComC1 or ComC5 only; requires 4 adjacent control ports For ComC1, C1 = TX-, C2 = TX+, C3 = RX-, C4 = RX+). For ComC5, C5=TX-, C6 = TX+, C7=RX-, C8=RX+)
63 RS-485 transparent, TX only. In this configuration the transceiver is left on so the A(-) and B(+) ports idle in a marking state (logical '1').
72 RS-422 full-duplex transparent. In this configuration, the transceiver for the transmit pair is left on. The transmit pair A(-) and B(+) idle in a marking state (logical '1').

1Only compatible with ComC5 and ComC7 for the CR1000X model. Compatible with ComC1-ComC7 on CR1000Xe model.

2Only compatible with ComC5 for the CR1000X model. Both ComC1 and Com C5 are compatible on the CR1000Xe model.
3Compatible with ComC5 or ComC7 for the CR1000X model. Compatible with ComC1, ComC3, ComC5, and ComC7 on CR1000Xe models.

NOTE:  Codes 6 and 7 are available on CR1000Xe data loggers and CR1000X models with OS versions later than v.7.02.

TIP: RS-422 protocol is similar to RS-485. Most RS-422 sensors will work with RS-485 protocol.