16 Original Instructions Sentry Equipment Corp
MODBUS Communications
The Sentry SBC Controller is designed to communicate via MODBUS. It is set to operate as a slave-only and the address
range is 1-247. See the chart below for proper addressing.
SBC Modbus Mapping
Utilize port MJ2 for Modbus communications!
Slave address range 1 - 247
Function Register Description Read / Write Units Data Size Data Type
1 3007 Air Eject Read/write 1 Bit
3020 Batch Enable Read/write 1 Bit
6071 Remote Enable Read/write 1 Bit
6072 Remote Start Read/write 1 Bit
2 15001 Auto (start) Read Only 1 Bit
15003 O (stop) Read Only 1 Bit
3 43180 IC Jar # (current
jar #)
Read Only 32 Int_32
43501 Sample Seconds Read/write Sec 16 Int_16
43502 Delay Read/write Sec 16 Int_16
43503 Purge Seconds Read/write Sec 16 Int_16
43504 Cycle Seconds Read/write Sec 16 Int_16
43505 Cycle Minutes Read/write Min 16 Int_16
43506 Cycle Hours Read/write Hrs 16 Int_16
43507 Batch Setpoint Read/write 16 Int_16
43512 Purge Delay Read/write Sec 16 Int_16
44100 Modbus Bit
Number Status
Read Only 16 Int_16
44101 Batch Complete Read Only 16 Int_16 (Bit 0)
44102 Batch Reset Read Only 16 Int_16 (Bit 0)
44103 IC Full Read Only 16 Int_16 (Bit 0)
44104 IC Door Open Read Only 16 Int_16 (Bit 0)
Modbus Wiring
Pin MJ2 Pins
Signal Direction
2 RX- / TX- IN / OUT
1 RX+ / TX+ IN / OUT
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