Serial Response Speed

The sensor recalculates the distance measurement every 12 ms. This is not a moving average. A new average is calculated for the

previous 12 ms of data.

With the SSI output, the data can be read every 1.4 ms (possibly the same reading for 8 or 9 readings, followed by a change). For the

most accurate prediction of the target location, take a sample at the 1.4 ms read-rate of the SSI and determine when the change

happens. In the worst case, the data is for the average target location and over the previous 12 ms, plus a 1.4 ms delay. For example,

the 12 ms average was changed just after the previous read had started.

RS422 Protocol

RS422 serial interface commands have this structure: <STX><Command><[Data]><EOT>. The sensor responds to the commands in three

different ways:

• <NAK>—The command was not recognized or the data is outside the limit values.

• <ACK>—The command was recognized and executed. The command requires no response data.

• <Data>—The command was recognized. The requested data was sent.

Definitions

STX

Start transmission (hex 02 or CTRL B)

EOT

End of text (hex 04 or CTRL D)

NAK

No acknowledgement (hex 15 or CTRL U)

ACK

Acknowledge (hex 06 or CTRL F)

Command

3-digit command (ASCII text)

[Data]

Whole numbers (ASCII text)

Note: In ASCII text (Command + [Data]), spaces and uppercase/lowercase letters are ignored.

RS422 Cable

The RS422 interface is a reliable, serial interface in full duplex mode with transfer rates up to 10 MBaud. The maximum cable length is

1,000 m (4,000 ft). The shielded cable is connected to the sensor connector and the ground terminal of the control cabinet.

RS422 User Commands and Their Meanings

Command

Data to LT7

Data from LT7

Meaning

GAP

All parameters in text format: LT7 $Revision x.xx$

Get All Parameters (all sensor parameters are displayed): sensor software

revision (number)

Pilot Laser Status

Pilot laser status (ON/OFF/xx seconds ON)

Serial settings

Serial settings

Discrete Output Q1 settings Discrete Output Q2

settings

•

Discrete output condition:

◦

ON: output high

◦

OFF: output low

•

Output mode

•

Limit 1 setting

•

Limit 2 setting

•

Hysteresis

•

Invert status ON/OFF

Analog Output QA settings

Analog output condition (diffuse sensors only):

•

Value 0 to 4095

•

Limit 1 setting

•

Limit 2 setting

•

Invert status ON/OFF

Output status

Output unit of measure: mm or one- hundredth of one inch (10 MIL)

Offset status

Offset setting (mm or one-hundredth of one inch)

Password setting

Password: enabled or disabled

Error status

Error status

P/N 120244 Rev. C

www.bannerengineering.com - Tel: +1-763-544-3164

13