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Despatch Protocol Plus Modbus Communications User Manual Page 13
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53
Chromalox I
nstr
uments and C
ont
ro
ls
A-51643 Rev
. 6 10/06/03
7
Table 4
:
P
rotocol
TM
Plus D
i
screte Output Add
ress Map
Data Address
Hex Address
Description
Security
0
$0000
Relay Output 1
0
1
$0001
Relay Output 2
0
2
$0002
Relay Output 3
0
3
$0003
Relay Output 4
0
4
--
7
$0004
--
$0007
Illegal, Reserved for
future inputs
0
8
--
65535
$0008 - $FFFF
Undefined, av
ailable for applicat
ion assignm
ent
0
1
2
...
8
9
10
11
12
13
14
15
16
17
18
...
52
53
Despatch Protocol
1
Revision History
2
Approvals
2
Table of Contents
3
A-51643 Rev. 6 10/06/03 iii
4
List of Figures and Tables
5
A-51643 Rev. 6 10/06/03 v
6
1 Overview
7
2.1 Support Specifications
8
2.2 Timing Specifications
8
2.3 Wiring
8
RS232 Jumper Settings
11
RS422 Jumper Settings
11
RS485 Jumper Settings
11
3 Register and I/O Mapping
12
Control Loop Input Registers
14
Global Input Registers
14
A-51643 Rev. 6 10/06/03 9
15
Global Holding Registers
16
A-51643 Rev. 6 10/06/03 11
17
A-51643 Rev. 6 10/06/03 12
18
A-51643 Rev. 6 10/06/03 13
19
A-51643 Rev. 6 10/06/03 14
20
4 Application Operations
21
Inputs, and Discrete Outputs
23
5 Function Set Details
26
6.1 Protocol Format
43
6.2 RTU Transmission Mode
43
6.3 Address Field
44
6.4 Function Field
44
6.5 Data Field
45
6.6 Error Checking Field
45
A-51643 Rev. 6 10/06/03 40
46
Figure 6 CRC Flowchart
46
7.1 Code Example
48
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