Pump addressing scheme
Reference information
106
Pump addressing scheme
As part of the communications protocol, every command string begins
with an address for the intended pump(s), e.g., [/2A1000R] in DT proto-
col, where 2 is the address.
The address corresponds to a device number set by the address switch
on the pump plus one. There are sixteen possible addresses on the bus.
For RS232, RS485, and CAN, the overall hexadecimal addressing scheme
is shown in Table 9-1. For RS232 and RS485 only, device settings with
corresponding hex and ASCII values are shown in Table 9-2.
Notice in Table 9-2 that the RS232/485 protocols allow multiple-device
addressing. A user can address not only single pumps, but also two
pumps (Dual Device), four pumps (Quad Device), or all 16 pumps (All
Devices). Address 5Fh (All Devices), for example, can be used to per-
form a simultaneous initialization on all pumps. Afterwards, each pump
can be addressed individually using 31h through 40h.
Table 9-1: Hexadecimal addressing scheme, RS232/485 and CAN
Address (hex)
Device
RS232/RS485
CAN
30
0
Master address (master controller, host, personal com-
puter, etc)
31...3F
1...F
Addresses single device.
41...4F
N/A
Addresses two devices at a time (dual device).
51...5D
N/A
Addresses four devices at a time (quad device).
5F
N/A
Addresses all devices on the bus.
Table 9-2: Device addressing values for RS232/485
Device
number
1
1.
Assigned by switch on pump.
Single Device
Dual Device
Quad Device
All Devices
Hex
Address
ASCII
Address
Hex
Address
ASCII
Address
Hex
Address
ASCII
Address
Hex
Address
ASCII
Address
0
31
1
41
A
51
Q
5F
-
1
32
2
2
33
3
43
C
3
34
4
4
35
5
45
E
55
U
5
36
6
6
37
7
47
G
7
38
8
8
39
9
49
I
59
Y
9
3A
:
A
3B
;
4B
K
B
3C
<
C
3D
=
4D
M
5D
]
D
3E
>
E
3F
?
4F
O
F
40
@
Note:
Multiple-device
addresses (Dual, Quad,
All) cannot be used to
query device status or to
issue report commands.
Each device must be
queried separately. Were
it not so, all the addressed
devices would attempt to
respond at once.
Summary of Contents for C24000
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