Obvius A8911-23 - Manual (Page 7)

Troubleshooting
Pulse count not incrementing:
Check the input LED for the specific input that is not working. The LED should blink when the pulse meter closes the
contact output. If th not blinking, try bridging the input terminals with a short piece of wire to confirm the LED comes on .
Try bridging the terminals at the other end of the pulse wiring run. This will confirm there are no breaks in the wire.
Verify the pulse output device is operating.
Disconnect the A8911-23 input and use a hand held digital meter and measure resistance of the pulse output device. Verify
that the pulse output device is operational and the contact closure reads less than 1000 ohms when closed. For high
resistance pulse devices such as intrinsic barriers, the “contact closure threshold” register may need to be configured to a
larger value. The default is 1k however up to 2.5k is allowed. If using the AcquiSuite data acquisition server, use the
advanced configuration page of the A8911-23 in the Modbus/device list to set this option.Modbus registers
Register Listing
The A8911-23 responds to the following Modbus/RTU functions:
0x11 Report slave id.
0x03 read holding registers (multiple)
0x06 preset single register
All Modbus registers are read-only unless otherwise noted. Registers listed as “NV” are options that are stored in non-
volatile memory and will be preserved when power is removed from the device.
Modbus 40xxx registers (read registers)
Data points:
------- ------- ------- ------------------
offset point type desc
0 40001 UINT32 pulse count 1 MSW (NV Mem, all pulse counts)
1 40002 UINT32 pulse count 1 LSW
2 40003 UINT32 pulse count 2 MSW
3 40004 UINT32 pulse count 2 LSW
4 40005 UINT32 pulse count 3 MSW
5 40006 UINT32 pulse count 3 LSW
6 40007 UINT32 pulse count 4 MSW
7 40008 UINT32 pulse count 4 LSW
8 40009 UINT32 pulse count 5 MSW
9 40010 UINT32 pulse count 5 LSW
10 40011 UINT32 pulse count 6 MSW
11 40012 UINT32 pulse count 6 LSW
12 40013 UINT32 pulse count 7 MSW
13 40014 UINT32 pulse count 7 LSW
14 40015 UINT32 pulse count 8 MSW
15 40016 UINT32 pulse count 8 LSW
16 40017 UINT32 pulse count 9 MSW
17 40018 UINT32 pulse count 9 LSW
18 40019 UINT32 pulse count 10 MSW
19 40020 UINT32 pulse count 10 LSW
20 40021 UINT32 pulse count 11 MSW
21 40022 UINT32 pulse count 11 LSW
22 40023 UINT32 pulse count 12 MSW
23 40024 UINT32 pulse count 12 LSW
24 40025 UINT32 pulse count 13 MSW
25 40026 UINT32 pulse count 13 LSW
26 40027 UINT32 pulse count 14 MSW
27 40028 UINT32 pulse count 14 LSW
28 40029 UINT32 pulse count 15 MSW
29 40030 UINT32 pulse count 15 LSW
30 40031 UINT32 pulse count 16 MSW
31 40032 UINT32 pulse count 16 LSW
Page 7 A8911-23