Instruction manual

Operation Page 13
Operation
Serial Null Modem Data Cable
Table 2.5 shows the wiring information for the Null Modem data cable.
Default Parameters
The default transmit/receive protocol is 9600 baud, eight data bits, no parity, and one
stop bit (8N1). When you first establish communications with the Sensor, your
communications interface must use this protocol.
The baud rate of the serial ports is adjustable using the $PASHS,SPD (speed) set
command, as described in Chapter 4, Com mand Response Formats; the data bit,
stop bit and parity protocol is always 8N1.
On initial power-up or after an internal reset, or after using the reset plug, the Sensor
default is 9600 baud for all three RS-232 serial ports A, B, and C.
The baud rates between the Sensor and the interfacing equipment must be the same
for the port and the device connected to the port.
To resume communication after changing the baud rate using the $PASHS,SPD set
command, you must change the baud rate of the command device.
Figure 2.5: Null Modem Data Cable