MODEL: 22LS1

22LS1 SPECIFICATIONS

ES-6557 Rev.6 Page 3/7

http://www.m-system.co.jp/

DESCRIPTIONS

■HOW TO SET STATION ADDRESSES

All units are connected in a series via a couple of modems. Assign to the pair of 22LS1 a number remote from those for 22LA1

units (such like FF, FE).

■DIP SWITCH SETTING

A) Modem type selecting:

Set SW1 through SW4 according to the type of modem combined with the 22LS1.

Transmission speed and format appropriate for each modem type are determined. If you change these settings, turn power

supply to the unit off and on.

B) Master/Slave selecting:

Set SW8 of a 22LS1 unit to Master and one of the paired unit to Slave.

If you change these settings, turn power supply to the unit off and on.

■HOW TO CALCULATE TRANSMISSION SPEED

A) When the total number of inputs at one side of the pair of modems (one station) is at the maximum of 256 in contact and 32

in analog:

N1: number of 22LA1-3A4 units

N2: number of 22LA1-3E5/-3E6 units

N3: number of 22LA1-3G3 units

N4: number of 22LA1-3G4 units

The number of input units (N1 to N4) determines Data Volume:

•Contact Inputs

B1 = (N1 + N2) × 6

•Analog Inputs

B2 = (N3 + N4) × 3 + (N3×8 + N4×4) × 2

•Total Data Volume

C0 = 5 + B1 + B2

Relation between the Total Data Volume and a time (Ta) required to transmit from one station (Master Station) is shown in the

following equation:

Ta = C0 × A

where A is a parameter determined by the transmission speed of modems:

A = 0.2933 (50 bps)

A = 0.0333 (300 bps)

A = 0.0083 (1200 bps)

A = 0.0042 (2400 bps)

The transmission speed (Tb) for the other station (Slave Station) can be calculated in the same way.

Actual time (TA) required for a contact (or analog) input to be transmitted from Master Station to Slave Station varies according

to timings of signal status change and transmission status, if there is no transmission error.

Ta ≤ TA ≤ Ta + Ta + Tb

B) When the total number of inputs at one side of the pair of modems (one station) is at the maximum of 256 in contact and 64

in analog:

When the total number of analog inputs exceeds 32, the 22LS1 divides them for transmission. Therefore time required for

transmitting analog and contact signals are different.

N1: number of 22LA1-3A4 units

N2: number of 22LA1-3E5/-3E6 units

N3: number of 22LA1-3G3 units

N4: number of 22LA1-3G4 units

The number of input units (N1 to N4) determines Data Volume:

•Contact Inputs

B1 = (N1 + N2) × 6

•Analog Inputs, first group

B2 = 88

•Analog Inputs, second group