GridBee Monitoring Setup Information
The GridBee is a modbus RTU slave device with a factory programmable slave ID. The ID can be changed in
the field with a properly programmed SD card. Contact Ixom Watercare, Inc. Customer Service for assistance.
Serial Interface
Type: RS-232
Connector: 9 pin male D-Sub
Pin assignments:
1 n/c
2 RXD
Receive Data Input
3 TXD
Transmit Data Output
4 n/c
5 Signal Ground
6 n/c
7 n/c
8 n/c
9 +12VDC, 1 Amp max
(Can be used to power some serial devices)
Serial/Modbus Communication Parameters
Rate: 19200 Baud
Bits/byte: 8
Stop bits: 1
Parity: N (none)
Handshake: None
Time between bytes sent to GridBee controller:
No greater than 20 milliseconds
Time between commands sent to GridBee controller:
At least 50 milliseconds
Read Holding Register
The GridBee supports modbus Function 3 - Read Holding Register.
A properly formatted “Read Holding Register” modbus message will be replied to with holding register data.
The “Read Holding Register” message consists of the GridBee slave address, the function (3), two bytes of
register address, two bytes of number of points, and the CRC. The address of the holding registers can be
found in the table below.
The format of the reply consists of the GridBee slave address, the function (3), a byte count (number of data
bytes), two bytes of data for each of the requested points, and the CRC.
When monitoring several GridBees on the same modbus network, query them sequentially. That is, query one
GridBee and wait for its response, query the next GridBee and wait for its response, etc. Querying the GridBees in
a manner such that the query/response messages can overlap or collide will cause inconsistent communication.
SCADA Accessory
Packages:
• Wireless Radio
• Laptop Monitoring
• RS-232 to RS-485 Converter
The GridBee GF with SCADA package provides the following
SCADA output capabilities: Controller shall have RS-232 serial
communication (Modbus RTU), DB9 male connection point.
Parameters available for monitoring:
1)
Motor RPM
2)
Motor Direction
3)
Motor Current
4)
Visual Indicator Status
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Technical Data Sheet
GridBee GF Series SCADA Output
1657_10362_20210805
O&M_GF1250PWc_10110_20210922 - 30
