ECR-POS

The general scheme

⋅⋅⋅The integration concerns three systems: ECR, MELLON POS and BANK:

⋅⋅⋅The usual flow of communication follows 4 steps:

1. The transactions starts from ECR: the operator selects “payment with card” as form of payment and ECR sends the corresponding request to POS.
2. POS immediately confirms to ECR the reception of the request and ECR enters into state to wait for the outcome.
3. POS connects to the bank to ask online authorization or approves the transaction offline or declines it offline or interrupts the transaction.
4. POS replies to ECR with the final outcome: declined or approved. In case of approval, POS sends complementary information (transaction number, approval code etc)

Physical Connections

CONNECTION OVER TCP/IP

⋅⋅⋅The integration concerns three systems: ECR, MELLON POS and BANK:

POS acts as “server” in relation to the ECR and as “client” in relation to the bank. The LAN switch can be external device or embedded in the cashier machine. Last chapter provides instructions about how to set up the connection for each POS type.

CONNECTION OVER USB

⋅⋅⋅This connection is not supported in Axium devices. The connection over USB is also supported, without any change in the protocol. However, that solution is not widely available in the existing POS applications.

Syntax of the Messages

Message [ECHO]

It is sent by ECR and initiated by the operator to check the connection with the POS (usually during the installation). Τhe terminal ID and the POS application version use also to be completed in the echo message:

ECR REQUEST:

X/<text>

POS RESPONSE:

X/<text>/T<tid>:<app-version>

Message [AMOUNT]

It is sent by ECR when a new sale is to start. When a cash advance transaction is to be started “H” needs to be used instead of “A”

ECR REQUEST:

A/S<session number>/F<amount>:<cur-code>:<cur-exp>
 /D<datetime>/R<ecr-number>/H<operator-number>
 /T<receipt number>/G<vat1>:<vat2>:<vat3>:<vat4>/M<custom-data>

Message [CONFIRMED]

It is sent immediately by POS as first answer to initial request for sale (or refund or void) of ECR, confirming that the request is being processed.

POS RESPONSE:

A/S<session number>/F<amount>

Message [RESULT]

It is sent by POS as final answer to initial request for sale (or refund or void) of ECR and carries the outcome of the transaction. The answer can be received immediately (if the request was approved or declined offline), within a few seconds (typical case of online authorization) or even in more than minutes in case of slow online communication or delayed PIN entry. It is suggested the setting in ECR of timeout >150 sec.

Syntax

R/S<session number>/C<rsp-code>{/D<trans-data>{/P<prn-data>}}

Example of declined sale

---

Timestamp	Log Entry	AMOUNT	RESULT	CONFIRMED
[211122 123929]	ECR connection from [10.1.101.132]
	ECR->POS: BYTES 81
	ECR0101A/S000677/F2500:978:2/D20211122123652/R8/H121/T000677/G:0:0:0:0/M123456789	2500
	POS->ECR: BYTES 22
	MEL0101A/S000677/F2500	2500
[211122 123929]	ECR request
[211122 123932]	TXN-L [1][535178xxxxxx6172][2500]	2500
[211122 123932]	Connecting [....................]
[211122 123935]	T [271]===>
[211122 123935]	<===H [88]
[211122 123939]	TXN-L declined (91) rrn=132630115039	2500	Declined	No
	POS->ECR: BYTES 20
	MEL0101R/S000677/C33		Declined	No
[211122 123940]	ECR connection closed

Example of approval

---

Timestamp	Log Entry	AMOUNT	RESULT	CONFIRMED
[211126 180434]	ECR connection from [10.1.101.217]
	ECR->POS: BYTES 82
	ECR0101A/S000728/F2000:978:2/D20211126180144/RE8/HA21/T000728/G:0:0:0:0/M123456789	2000
	POS->ECR: BYTES 22
	MEL0101A/S000728/F2000	2000
[211126 180434]	ECR request
[211126 180439]	TXN-L [1][491791xxxxxx3489][2000]	2000
[211126 180439]	Connecting [....................]
[211126 180441]	T [117] ===>
[211126 180441]	<===H [108]
[211126 180454]	T [167] ===>
[211126 180455]	<===H [102]
[211126 180455]	TXN-L authorized (787032) rrn=133030119089	2000	Approved	Yes
	POS->ECR: BYTES 121
	MEL0101R/S000728/C00/DVisa Credit:************3489:2000:1500:111:64999999:000091:133030119089:000065:787032:20211126180454	2000	Approved	Yes
[211126 180455]	ECR connection closed

Testing the connection between ECR and POS

POS listens for ECR requests in port 4000. Trivial test can be performed with echo message.