SSI America 7SL instruction manual Serial Interface, Common

Page 11

D) Serial Interface

For units built with optional RS-485 communication

I

A/A'

A'/A

N

11

M

S

T

B/B'

B'/B

A

R

S

12

U

T

M

COMMON

E

E

R

13

N

T

Maximum cable length: 1.5 km (9/10 mile) at 9600 baud.

NOTE: According to EIA specification for RS-485:

a)The “A” terminal of the generator shall be negative with respect to the “B” terminal for a binary 1 (MARK or OFF) state.

b)The “A” terminal of the generator shall be positive with respect to the “B” terminal for a binary 0 (SPACE or ON) state.

The RS-485 interface can connect up to 31 instruments with the remote master unit (see below).

	I	A/A'	A'/A
	N	A/A'	A'/A
	S	11		M
	S			M
	T			A
	R	B/B'	B'/B S
	U	12		T
	U			T
	M		COMMON	E
	E	13	COMMON	R
	E			R
	N
	N
	T

I

N11

S

T

R12

U

M

E13

N T

1 1

7sl-1-00.p65

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9/17/02, 2:39 PM

Image 11

Contents Model 7SL HIGH/LOW Limitrol 16 DIN, Four Digit HIGH/LOW Limitrol Guide to simple set-up CongratulationsUSE Wire Suitable For 75C Minimum Table of ContentsMounting Requirements Dimensions and Panel Cutout Measuring Inputs TC Input Wiring GuidelinesTerminal Layout Logic Input Linear InputRTD Input RTD7sl-1-00.p65 17/02, 239 PM OUT Relay OutputsCommon Serial InterfacePreliminary Hardware Settings Power Line and groundingPower Supply Limitrol without RS-485 Limitrol with RS-485Configuration Procedure Configuration KEY FunctionsR1 = Input Type and Range Value R2 = Decimal Point Position R5 = Offset AdjustmentR7 = Alarm Action on Fault C2 = Acknowledgment ModeControl Output Function P2 = Alarm configuration C3 = Reset at Power-upC4 = Reset Memory OFF = P3 = Alarm ActionAlarm Standby Function = Safety LockT1 = Timeout Selection tn10 = 10 second timeout Reset Operating ModeNormal Display Mode IndicatorsKey Functions in Parameter Display Mode Key Functions in Normal Display ModeParameter Display Mode Operating Parameters Dealing with Error Messages Error MessagesError Messages Error ListLoading Default Configuration Parameters Default ParametersLoading Default Operating Parameters Default Operating Parameters ListPara Default Configuration Parameter ListSpecifications Normal Mode Rejection Ratio Display Update Time RangeTemperature Drift Common Mode Rejection RatioType of Alarm Acknowledgment ModePower-Up Mode Alarm FunctionENV50140 ReferencesCEI 70-1 IEC NemaCalibration Parameters Calibration ProcedureGeneral Guidelines Entering Calibration Values ProcedureTH TC Input Final Scale Value TC Input CheckPL RTD Input Initial Scale Value PH RTD Input Final Scale ValueRTD Check RJ. Cold Junction Compensation CheckVolt Input Check AH Current Input Final Scale ValueCurrent Input Check NH 5 Volt Input Final Scale ValueUH 10 Volt Input Final Scale Value UL 10 Volt Input Initial Scale ValueMaintenance Manual Part No 7SL