Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instruction Manual - Manual (Page 347)

B.1.6 SOFTWARE CHARACTERISTICS
1. Transparency Rule - whenever 7E hexidecimal is transmitted as anything other than
SOH, a 00 byte will be inserted directly following it (byte stuffing).
2. All transactions are initiated by the Host or SUPERVISOR-PC.
3. All controllers begin their response within 10 ms after the end of the transmission by
the Host or SUPERVISOR-PC; otherwise, a faulty transmission may be assumed.
4. Illegal messages received by the controllers are ignored.
5. The maximum number of data bytes per message is 32 (decimal).
B.1.7 HARDWARE CHARACTERISTICS
1. Transmission Speed - standard rates are 110 - 28800 baud.
2. Asynchronous by character.
3. A character is:
1 Start bit.
8 Data bits - the Least Significant Bit (LSB) is transmitted first.
1 Even Parity bit.
1 Stop bit.
4. Line is 4-wire, shielded twisted pair, type RS-422/485.
B.1.8 DATALINK NODE LIST
Datapoints B608 through B639 are the Net D (Datalink) Node List that are used by a controller
functioning as a gateway in Datalink Interrogator Mode. Normally, a controller does not require a
node list for Datalink communications, as this network does not have peer-to-peer message trans-
actions but operates only in interrogator/responder mode. However, as a gateway in Datalink Inter-
rogator mode, the controller replaces the Datalink Supervisor-PC and initiates communication to
the other nodes in the network. Because a Datalink network can have 32 devices, a datapoint ex-
ists in the
Network D Node List (B608-B639) that sequentially correlates to each device address 0-
31. The node list is used by the controller to identify the device type at each network address
0-31. Presently, there are nine codes (0-8) assigned that may appear in the node list:
Table B-4. Node List Assignment Codes
Code Device Code Device Code Device
0 Node not
accessible 3 53SU1000 MICRO-
DCI Supervisor 6 50MM1000
Mass Meter
1 53MC1000
MICRO-DCI Controller 4 53MC2000
MICRO-DCI Controller 7 53MC5000
MICRO-DCI Controller
2 50KM2000/53MC4000
Chameleon 5 50DK3000
Magmeter Converter 8 Recorder Model 2345
53MC5000 Process Control Station
B-8