MICROTEL 700 communication protocol

Supported device types and versions
Communication line configuration
Communication station configuration
Alternative communication path
I/O tag configuration
Redundant system
Errors and problems
Detail implementation of protocol
Tell commands
Literature
Changes and modifications
Document revisions

Supported device types and versions

-

Communication line configuration

Category of communication line: Serial, SerialOverUDP Device Redundant, RFC2217 Client, TCP/IP-UDP
Parameters of serial line according to the setting of telemetry system.
UDP Parameters:
- The parameters of primary server or secondary (or parameters of primary/secondary network interface in case of a server with multiple network interfaces) one are mandatory.
- Host: string max. 80 characters – a server name in the INET form (the name or numerical address a.b.c.d).
- Port: UDP port number (1 to 65535).

Global parameters:

Key word

Full name

Description

Unit / size

Default value

SCAN

Scan

Permanent passive mode (Scan only) only for data reading (mode 2).

YES/NO

NO

MOXAT

Moxa Timeout

Setting of timeout for change to other communication device on SerialOverUDP Device Redundant line. If the valid data are not received from communication device till timeout, the other device is used (backup or primary, if it is configured).

20

sec

Communication station configuration

Communication protocol: Microtel 700.
Station address is a number within the range 1 to 253. Do not use the addresses 0, 254 and 255. They are filtered because they often occur at the beginning of response (error in transmission system).

Parameters of station protocol

Dialog window of station configuration - tab "Protocol parameters".

Table 1

Key word	Full name	Description	Unit / size	Default value
RC	Retry Count	Number of retry calls when error in communication occurs.	-	2
RT	Retry Timeout	Delay between retry call if a communication error occurs.	ms	500 millisec.
WFT	Wait First Timeout	The first waiting for a response after sending a call.	ms	300 millisec.
WT	Wait Timeout	Delay between the readings of a response until it is completed.	ms	200 millisec.
MWR	Max Wait Retry	Number of retry response reading until it is completed.	-	20
MODULE_CNT	Module Count	Maximum number of modules that are required in one call. The value must be in the range of 1 to 5. If not, the default value is used.	-	5
INV_MOD	Inversed Modules	An analyze of sectors that have been changed (the function COS - CHANGE OF STATE) is done in inverse order: bit 0 LSB - modules 0..7, bit 1 - modules 8..15, ... bit 7 MSB - modules 56..63.	YES/NO	NO
AHOST	Alternative Path Host(s) 1, 2	The configuration of so-called alternative communication path. It is IP address, hostname or several IP addresses/hosts separated by commas or semicolon. The total number of alternate communication paths entered under these parameters is 12. Empty value means than an alternative path is not used.
APORT	Alternative Path Port 1,2	UDP ports to which data will be sent when using the alternative communication path.		0
APRC	Alternative Path Retry Count	Number of retry call if the alternative communication path is used.	-	2
APUT	Alternative Path Use Timeout	After the elapse of the defined time since the start of using alternative communication path, the viability of communication through standard path is tested again according to the communication line configuration. Value 0 turns off the testing (communication uses an alternative path while it works). Note: The parameter value also changes the order of trying the alternative communication paths in case of their malfunction. If the value is nonzero, the standard communication path is always tried after an alternate communication path. If the value is zero, then all alternative communication paths are tried first and only then the standard communication path.	sec	600